While that just looks like a box with solar panels attached, that box makes the stuff life is made of. Swiss company Trunz's Water Systems 200 is a solar-powered water filtration system that sets up in 30 minutes, needs no fuel, and filters viruses and bacteria out of any non-saline water source, producing 900 liters of potable water in an hour. (The saltwater version, below, cranks out 250 liters per hour.)
Trunz's device can also be converted to run on wind power in areas where the sun don't shine, and regardless of the power source its batteries can store enough to chug on for 24 hours a day. It's basically a disaster relief dream come true, and all in a fairly portable size--roughly 1.5 meters in each dimension.