Trust me, a solar still is not something to make in the desert unless you want to die quicker!! I used to teach survival and would make one, prime it with a gallon of water and after about 6hrs I would show the students the results, a half cup or less of water. They work good on snow or in wet climates to gain clean water of you can't find any running. Solar still, stay in the sun long enough and lie still <img src="images/graemlins/smile.gif" alt="" />