I got this information from eHow and it's good information to know. Gathering water through the use of a solar still: 1. Clear plastic sheet for cooling condensate. 2. Sheet anchor stones (in a shallow ditch). 3. Condensate runs along sheet to drip into can. 4. Collection can, at bottom of dug pit, holds condensate & tube end. 5. Drinking tube from can bottom to outside still. 6. Soil or other material, containing all the water you hope to drink. ------------------------ Here's a diagram on creating a water filter that hangs from a tree or other item out of a plastic bag, sand, rocks, and charcoal. click in the photos to enlarge them.