The Katadyn BeFree AC 1.0 L Water Filter Bottle is available in Slate Blue, Moss Green and Misty Red for $49.95 at REI. It's also available in a smaller version 0.5L for $44.95. Remember that water ...

Here's what scientists say you can do about it. Carl Behnke had always wondered how clean his reuseable water bottle was. When he stuffed some paper towels inside and smeared them around ...