Still This a improved version of the solar still described elsewhere. This is a device that could be made as a small unit or a much bigger one depending on the parts you can acquire. I believe most of the parts solar cell and pumps can be obtained from various sources. The majority of survival books, including military manuals, present solar stills as a reliable way to obtain water in arid lands. Yields are often expressed in maximum amounts under ideal circumstances, leading people to assume they can get water anywhere and anytime from a hole covered with a sheet of plastic.
Solar energy heats the ground by passing through a clear plastic barrier.
Moisture from the soil then evaporates, rises and condenses on the underside of the plastic barrier above. The still also has the ability to purify tainted water. In fact, it condenses pure water from just about anything. Even urine will produce clean, drinkable water. This process extracts pure water from contaminated sources, using only the sun.