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Most of us know that boiling is one of the most effective methods to purify drinking water in the wild. In mere minutes, boiling can destroy any nasty viruses, bacteria, protozoa, and other waterborne pathogens that could otherwise wreak havoc in your digestive system or kill you.
However, boiling water off the grid may not be as easy as it sounds. Unless you have a sturdy single-walled metal water bottle, canteen, or pot, you can't simply toss it into the fire and wait for the water to boil.
Notice we said single-walled water bottle—the popular double-walled or insulated bottles found at many stores must not be placed on an open flame, and may even explode from the heat. Composite and plastic bottles can't take the heat either, and will begin to melt over the flames. So, how do you boil water if you don't have a metal vessel to boil it in?
The answer is both simple and ancient: hot rock boiling. You can simply heat several rocks over a campfire, then pick them up with sticks, and drop them into the water vessel of your choice. The residual heat of the stones will heat the water rapidly, and eventually bring it to a boil, purifying it.
Here's a video that shows how it works (you may want to mute the audio if you're not a fan of smooth jazz):
Notice in the video, hand-carved wood vessels are used, and the rocks are rinsed to remove ash and soot before adding to the drinking water. Both of these are smart choices—although small amounts of ash from the campfire may not be harmful to drink, they certainly won't taste good.
A few more tips:
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