The LifeStraw Personal Water Filter is a filter for drinking straight from the source. Out for a hike, backpacking for a period of time, even just keeping it in your emergency kit. It's really just a big straw, with a filter inside. Uncap both ends, putting the bottom end into the source water. Let it soak up for 10 seconds or so, then take sips from the straw end. It'll filter out bacteria and waterborne parasites so you can stay hydrated without getting sick.
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