Save on a LifeStraw for Prime Day and drink water from anywhere. (Amazon)

Early Amazon Prime Day deals are here, and the LifeStraw is among the best. With this deal, you can save on single, two-, three- and four-packs of the portable water filter, which removes up to 99.9% of bacteria, parasites and microplastics from water found in lakes, streams and other natural sources. Tens of thousands of positive reviews have helped make it a favorite among Amazon shoppers.

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LifeStraw personal water filter: $15.47 (9% off)

Original price: $16.95

Thousands of positive reviews suggest the LifeStraw is a practical, helpful filter. (Amazon)

With more than 120,000 reviews and a 4.8-star rating, the LifeStraw ranks among Amazon's most popular outdoor products. Thanks to this early Prime Day discount, shoppers can pick one up for just $15. One reviewer called it an "indispensable companion" for travel and outdoor adventures, praising its filtration capabilities and portability.

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With more than 10,000 sold on Amazon in May alone, this low-cost investment makes for the perfect camping or hiking tool. To use it, simply dip the straw in a stream or other freshwater source and drink — that's it.

Reviewers said the LifeStraw is especially useful when traveling to areas where tap water may not be safe to drink. One shopper who used it overseas said it was particularly useful when they had no access to water during a trip. "It really came in handy for me when I arrived late at night and couldn't purchase water, but I was dying of thirst," the reviewer wrote.

LifeStraw personal water filter: $15.47 (11% off)

Original price: $16.95

The lightweight straw fits easily with your other gear. (Amazon)

A single LifeStraw filters 1,000 gallons of water, giving you an affordable, long-lasting device. You can also grab two-, three- and four-packs to share with friends or stock up for yourself.

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Also, since it was originally designed to help those in less developed countries, every purchase gives a schoolchild in need safe drinking water for a year. So, you get to make a difference for less than $20.

One reviewer, who generally had a positive experience with the LifeStraw, noted one minor setback: "If you need to filter large quantities (for your family campsite, for cooking, etc.), this is not what you need." Instead, the shopper recommends investing in a gravity filter or iodine tablets.

If you're an Amazon Prime member, you can get your LifeStraw sent to your door ASAP. You can join or start a 30-day free trial to start your shopping today.