People living along the ocean, or salt water barriers might get a kick out of this. It seems that MIT has developed a portable solar powered solar desalination unit. Besides, MIT, IBM along with some people from Saudi Arabia are also working on a solar powered desalination unit.
The small version of the MIT desalination unit is supposed to be able to produce 80 gallons of drinking water every 24 hours. The larger version has an estimated cost of $8,000 and will produce an estimated 1,000 gallons of water everyday.