There are a lot of reasons you should carry a bottle of water with you whenever you go on an adventure. But who would have thought that starting a fire was one of them?

What makes this even more useful is that while you are attempting to use the sun's ultraviolet rays to focus an ember onto some tinder, your water is being purified by the sun. Two birds with one stone.

Another benefit of this is that if the fire gets out of hand, you can just use the water to put it out quickly.

If you want to see exactly how you can use a clear plastic water bottle to focus the sun onto a patch of dry grass or leaves, check out the video on the next page.

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