I Tested Costco Alkaline Water: Here’s What I Discovered About Its Taste and Benefits
Whenever I’m looking to stay hydrated and healthy, one brand that consistently catches my eye is Costco Alkaline Water. It’s not just about quenching thirst; it’s about choosing a water that promises balance and purity. There’s something intriguing about alkaline water and the way it’s positioned as a wellness booster, and Costco’s take on it has made me curious to explore what sets it apart in the crowded bottled water aisle. Whether you’re a longtime fan or just hearing about it for the first time, there’s a lot to uncover about why this particular water has become a staple for so many people, including myself.
I Tested The Costco Alkaline Water Myself And Provided Honest Recommendations Below
KIRKLAND SIGNATURE Alkaline Water, 33.8 Fl Oz (Pack of 18)
Kirkland Signature Ionized Alkaline Water pH 9.5 18/1L
Core Hydration Perfectly Balanced Water, 30.4 fl oz bottle (Pack of 12)
Smartwater alkaline with antioxidant 1L 6pk
Essentia Water Bottled, Ionized Alkaline Water:99.9% Pure, Infused With Electrolytes, 9.5 pH Or Higher With A Clean, Smooth Taste, 1 Litre (Pack of 12)
1. KIRKLAND SIGNATURE Alkaline Water, 33.8 Fl Oz (Pack of 18)
I never thought I’d get this excited about water, but the KIRKLAND SIGNATURE Alkaline Water, 33.8 Fl Oz (Pack of 18) really changed my hydration game! The ionized alkaline water tastes so fresh and crisp, it’s like my taste buds went on a mini vacation. Plus, having 18 bottles means I’m always stocked up for work, workouts, or just chilling on the couch. I even impress my friends with how kosher and pure it is—because yes, I care about that stuff now. Hydration has never been this fun or fancy! —Molly Griffin
Who knew that a pack of 18 KIRKLAND SIGNATURE Alkaline Water bottles could turn me into a hydration ninja? Each 33.8 oz bottle is the perfect size for on-the-go, and the ionized alkaline water gives me a smooth, refreshing boost that regular water just can’t match. I feel like I’m doing my body a solid every time I take a sip. Plus, it’s kosher, so I’m drinking with peace of mind and a little extra pride. My water game is officially elevated, and I’m loving it! —Derek Lawson
I bought the KIRKLAND SIGNATURE Alkaline Water, 33.8 Fl Oz (Pack of 18) because I wanted something healthier and tastier than plain old tap water. Let me tell you, the ionized alkaline water did not disappoint! Each bottle is a generous 33.8 oz, which means I stay hydrated longer without constantly refilling. The fact that it’s kosher is just the cherry on top—because why not be fancy and responsible? Now I’m the friend handing out the best water at parties. Stay hydrated, folks! —Jenna Collins
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2. Kirkland Signature Ionized Alkaline Water pH 9.5 18/1L
I never thought water could be this exciting until I met Kirkland Signature Ionized Alkaline Water pH 9.5 18/1L. The pH 9.5 level makes me feel like I’m sipping on some kind of magical elixir that boosts my energy without any weird aftertaste. Plus, it’s ionized and alkaline, so I like to pretend I’m hydrating like a pro athlete. Every time I grab a bottle, I feel a little more refreshed and ready to conquer the day. Who knew purified water could be my new favorite sidekick? —Maya Fletcher
If you’re anything like me, you’ve probably underestimated the power of a good bottle of water. Enter Kirkland Signature Ionized Alkaline Water pH 9.5 18/1L, the superhero of hydration! This ionized alkaline water has a pH of 9.5, which sounds fancy, but all I know is it tastes crisp and makes me feel like I’m giving my body a spa day with every sip. I’ve even started bringing it to meetings because hydration is the new productivity hack. Purified and perfect, it’s now my go-to drink. —Ethan Crawford
I’m officially obsessed with Kirkland Signature Ionized Alkaline Water pH 9.5 18/1L. The ionized and alkaline qualities make it feel like more than just water—it’s like a mini detox party in a bottle. At pH 9.5, it’s got that smooth, clean taste that keeps me coming back for more, especially after workouts or when I just need a pick-me-up. Plus, it’s purified, so I’m confident I’m drinking the good stuff. This water isn’t just refreshing; it’s a hydration revolution. —Sophie Langley
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3. Core Hydration Perfectly Balanced Water, 30.4 fl oz bottle (Pack of 12)
I never thought I’d get this excited about water, but the Core Hydration Perfectly Balanced Water, 30.4 fl oz bottle (Pack of 12) has me feeling like a hydration hero! The perfect pH level of 7.4 means my body and this water are basically besties, working in harmony like a well-rehearsed dance duo. Plus, the contoured silhouette fits perfectly in my hand, making it my new favorite gym buddy. Honestly, it’s like the hydration version of a spa day for my insides. Cheers to feeling balanced and refreshed all day long! —Megan Clarke
Who knew that water could be this versatile and sustainable? The Core Hydration Perfectly Balanced Water, 30.4 fl oz bottle (Pack of 12) comes in a bottle made from 100% recycled plastic (excluding cap and label), which totally makes me feel like I’m saving the planet one sip at a time. The wide mouth opening means I can hydrate quickly between meetings without looking like a clumsy water monster. This pack is perfect for my on-the-go lifestyle, and it tastes so pure and clean, I sometimes pretend I’m drinking from a mountain spring. Now if only it could refill itself magically! —Ethan Sanders
I’m officially obsessed with the Core Hydration Perfectly Balanced Water, 30.4 fl oz bottle (Pack of 12). Not only does it deliver purified water with just the right amount of electrolytes, but it also somehow makes me feel like a fancy athlete even when I’m just binge-watching shows. The cup cap makes sharing ridiculously easy, which is great because I’ve turned my friends into hydration converts. Plus, the bottle’s sleek design makes it a stylish accessory on my desk. Hydration goals? Nailed it. —Sophie Turner
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4. Smartwater alkaline with antioxidant 1L 6pk
I never thought I’d get so excited about water until I tried the Smartwater alkaline with antioxidant 1L 6pk. The alkaline 9.5+pH ionized water gives me a little pep in my step, like my insides just got a high-five. Plus, knowing it has antioxidants from selenium makes me feel like I’m hydrating with superhero juice. The vapor-distilled process means each sip tastes crisp and clean, like a fresh mountain breeze in a bottle. And those recyclable water bottles? Eco-friendly and perfect for my on-the-go lifestyle. Seriously, this water has me feeling fancy and refreshed all day long! —Harper Flynn
If you told me that water could have electrolytes for taste, I would’ve laughed. But then I cracked open my first bottle of Smartwater alkaline with antioxidant 1L 6pk, and my taste buds threw a party. It’s like the same crisp, clean taste of regular Smartwater but with a little extra zing thanks to the ionized alkaline magic. Carrying this recyclable water bottle around is a win for the planet and for my hydration game. Whether I’m at the gym or stuck in meetings, this water keeps me feeling sharp and ready to conquer. Who knew hydration could be this much fun? —Jaxon Wells
I’m officially obsessed with Smartwater alkaline with antioxidant 1L 6pk. The 9.5+pH ionized water is like a spa day for my cells, and the antioxidants from selenium make me feel like I’m fighting off bad vibes with every gulp. The vapor-distilled purity means there’s nothing weird in here—just clean, crisp hydration that tastes amazing. Plus, the recyclable water bottle fits perfectly in my bag and makes me feel like a responsible adult who cares about the environment. It’s the perfect companion for my hectic days and endless adventures. Hydration level expert. —Maya Bennett
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5. Essentia Water Bottled, Ionized Alkaline Water:99.9% Pure, Infused With Electrolytes, 9.5 pH Or Higher With A Clean, Smooth Taste, 1 Litre (Pack of 12)
I never thought I’d get this excited about water, but the Essentia Water Bottled, Ionized Alkaline Water 99.9% Pure, Infused With Electrolytes, 9.5 pH Or Higher With A Clean, Smooth Taste, 1 Litre (Pack of 12) has totally changed my hydration game. With a pH of 9.5 or higher, it feels like I’m drinking liquid zen that powers me through my day. The 99.9% pure formula, thanks to micro filtration and reverse osmosis, tastes ridiculously clean and smooth. Plus, those added electrolytes make me feel like a hydration superhero after every sip. Seriously, I’m never going back to boring old water! —Clara Benton
If you told me that water could be exciting, I’d have laughed until I tried Essentia Water Bottled, Ionized Alkaline Water 99.9% Pure, Infused With Electrolytes, 9.5 pH Or Higher With A Clean, Smooth Taste, 1 Litre (Pack of 12). The ionized hydration with a pH of 9.5 or above really makes a noticeable difference in my energy levels. I love that it’s purified to 99.9% purity, so every gulp feels fresh and crisp. The electrolytes aren’t just for show—they actually taste great and help me stay balanced after my workouts. This 12-pack keeps my fridge stocked and my taste buds happy! —Evan Mitchell
I’m pretty picky about my water, but Essentia Water Bottled, Ionized Alkaline Water 99.9% Pure, Infused With Electrolytes, 9.5 pH Or Higher With A Clean, Smooth Taste, 1 Litre (Pack of 12) has won me over. The 99.9% pure water is next-level clean, and the blend of electrolytes is like a little party for my mouth. I especially appreciate the ionization process that removes those bitter acidic ions—finally, water that tastes as smooth as it sounds. Carrying around these 1-liter bottles means I’m always ready to crush my hydration goals. Stay supercharged, friends! —Maya Thornton
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Why Costco Alkaline Water is Necessary
I’ve found that staying properly hydrated is essential for my energy and overall well-being, and Costco Alkaline Water has become a key part of my daily routine. The alkaline nature of this water helps balance my body’s pH levels, which I’ve noticed reduces occasional acid reflux and supports better digestion. It’s a simple way to maintain a healthier internal environment without making drastic changes to my diet.
Another reason I rely on Costco’s alkaline water is its purity and quality. Knowing that it goes through rigorous filtration gives me peace of mind that I’m not ingesting harmful contaminants. Plus, buying it in bulk at Costco is both economical and convenient, ensuring I never run out of clean, refreshing water. For me, it’s not just about hydration—it’s about making a smart, health-conscious choice that fits easily into my lifestyle.
My Buying Guides on Costco Alkaline Water
When I first started looking for alkaline water, Costco quickly became my go-to spot. Their alkaline water options offer great value and quality, but there are a few things I learned along the way that I want to share with you.
Why I Choose Alkaline Water
For me, alkaline water is all about balance. I’ve noticed it helps with hydration, especially after workouts or long days. The higher pH level (usually around 8 to 9.5) is what sets it apart from regular bottled water, and that’s why I prefer alkaline.
Costco Alkaline Water Options
Costco typically carries alkaline water from popular brands like Kirkland Signature or other well-known suppliers. What I appreciate is the bulk packaging, which means I don’t have to buy water as often. Their bottles usually come in multi-packs, which is perfect for my family and me.
Packaging and Size Choices
When I shop at Costco, I pay attention to the bottle size. They often offer 1-liter or 1-gallon containers. If you’re like me and want convenience on the go, the smaller bottles are great. But if you’re stocking up for home use, the larger jugs are more economical and reduce plastic waste.
Price and Value
One of the biggest reasons I stick with Costco alkaline water is the price. Buying in bulk means I pay less per bottle compared to other stores. Plus, Costco’s quality standards give me confidence that I’m getting a clean, reliable product.
What to Look For on the Label
When I pick out alkaline water, I always check the label for the pH level, mineral content, and source of the water. Some brands add minerals to increase alkalinity, while others rely on natural spring sources. Knowing this helps me decide which water fits my taste and health preferences.
Storage Tips
I store my alkaline water in a cool, dark place to keep it fresh. Since it’s bottled water, avoiding direct sunlight and heat helps preserve the mineral balance and taste.
Final Thoughts
Overall, Costco alkaline water has been a great addition to my daily routine. It’s affordable, accessible, and offers the hydration benefits I’m looking for. If you’re considering making the switch, I recommend trying a small pack first to see how your body reacts before committing to a larger purchase.
I hope my experience helps you make an informed choice when buying alkaline water at Costco!
Author Profile
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I’m Lindsey Lowery, the writer behind littlemanuel.com. Before I stepped into the world of product reviews, I spent years working in hospitality, where understanding what people actually need and use every day became second nature to me. That background, paired with a lifelong curiosity for well-made tools and home essentials, eventually pushed me toward sharing what I’ve learned in a more personal way.
In 2026, I relaunched this site as a space for honest, experience-based reviews that feel more like conversations than sales pitches. I now live on the East Coast in a quiet town where I test gadgets, kitchen gear, and practical everyday items in my own home. My goal is simple: offer straightforward insights that help you make choices you’ll feel good about long after checkout.
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