Andy posted this over at SYKW survival forum that I thought was interesting.

Here's a possibility of a inexpensive solar still for 3rd worlds. It's pretty primitive, you have to deploy a few of them to be effective at 1.0 to 1.7 Liters of condensed water per day (24 hours).


http://www.watercone.com/product.html
http://www.worldchanging.com/archives/003889.html