Finding sterile water while backpacking (or survival) can be tough. The SteriPen UV water purifier plans to change that. Complete with a built in USB rechargeable battery this unit is designed to purify 16 ounces of water in 48 seconds. The UV light kills any bacteria or viruses that may be present in the water source. Optional accessories are available for fitting a large water bottle. Sadly, it won’t change the way the water tastes.