CamelBak All Clear UV Microbiological Water Purifier

Cleaning water using ultraviolet light removes 99.99 percent of viruses, protozoa and other microscopic beasties you’d rather not ingest that most filters can’t catch, and now you can do it on the go. (Chemical treatments also remove such things but take far longer.) CamelBak has incorporated UV into a lightweight one-liter bottle that lets you treat the water easily and quickly: Just fill it up, press a button, and in 80 seconds the LED screen indicates that you’re ready to drink.
From $100; camelbak.com