It is always possible to posit scenarios from which there is no good outcome. A situation in which you have no access to water is one. Think of the crew of the B-17 that flew into the Sahara during WWII..(I know Chris will recall the name of the plane and all the details, right?)

If there is no water source near you, your best bet is to travel to (hopefully) the nearest. The best tool in this case will be a good map, supplemented by your observations as you made your way into your situation. Sharpen your map reading skills - I recall a hike some years ago where we walked eight miles out of our way to get water, basically because we did not read the map carefully enough. Learn to look for the signs of water - in a desert, trees or any green vegetation is a good bet. Even then you might want to dig, probably in a likely spot in a streambed or similar.

In a tight, I would rather spend whatever energy I had in travelling to a water source than screwing around with a solar still. Travel at night and don't waste any effort. <img src="images/graemlins/cool.gif" alt="" />