When you're out on the Path and in necessity of hydration make sure you're carrying the Katadyn MyBottle Purifier Bottle. Not only used in the wilderness, but int he office and around town as well, the MyBottle Purifier is the only EPA registered bottle purification system available. Katadyn uses 3 Stage Virustat purification technology with activated carbon to remove bacteria, viruses, and cysts. small and lightweight, the Katadyn MyBottle Purifier Bottle is Great for camping, hiking, and travel; and the MyBottle includes a drinking straw to use as your everyday H2O bottle.