Six hours of sunlight will disinfect water in a clear container. A simple solar disinfector is a plastic bottle full of water exposed to the sun.
I hope our brothers and sisters in Haiti are using this survival trick.
More at http://www.sodis.ch/...
Solar distillation with designs like theWatercone are available.
There is also the Lifestraw, a personal water purifying device.
More at
Solar Water
Survival Design in NYC
Solar IS Civil Defense, Illustrated
cross posted at dailykos.com, eurotrib.com, and globalswadeshi.net