Safe Drinking Water: Boiling  Don't touch that water until
you've used at least one of these methods  safe drinking water
camping wilderness hiking water treatment boiling      Photo:
Nikitin Victor/  How it works: Whether you’re a backpacker or a
whitewater boater, historically, the most common way to treat
your water is boiling. Boiling your water for a minute kills
anything living. In a high-mountain environment, it may be all
you need.  Pros: Cheap—you don’t need any special equipment
Cons: Doesn’t remove chemicals or organic matter floating in
your drink. It also takes time and fuel.  What you need: A
stove, like Jetboil’s Flash, a campfire, or any other source of
high temperature heat.  More at Outside  Elsewhere on the Web