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SteriPen Ultra
This device emits a bright light which kills all the bacteria in tap water that could make you sick. This is a great way to not only cut down on plastic, but also save you money on buying water bottles. And if you have ever been to anywhere hot, you know just how quickly those purchases can add up! All you need to do is fill up a bottle, blast it with the light, and have clean and pure drinking water in seconds.

SteriPen Ultra, $110, Amazon