If you jsut want to buy something like this, then take a look at: http://www.landfallnavigation.com/memss.html. You might be able to find one elsewhere for a better price.

Kind of disagree with BobS. I think solar still are for when you have water, but you just do not know how clean it is. I'm sure there are a few chemicals that could evaporate and condense with water, but there are few of them. Bacteria and other comtaminants should be left behind in the "brine." A solar still should take care of cleaning most thigns out of a water supply. However, they do not produce that much water.