Solar Still
A solar still is a cheap way to purify water. It can also be used in the desert, to get water. The build a still, you dig a hole into the ground and put a cup, at the bottom. Then you use plastic to form a v shape. Then the top of the hole is also covered with plastic. When, the water is evaporated, from the ground, the plastic catches the water and then drops it into the cup.
Some companies charge as much as $200.00 for a basic solar still. It is important to note that you can build your own for a few dollars. Here is a link so you can see what it will look like. http://en.wikipedia.org/wiki/Solar_still
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