The most effective way to clean found water is to boil it. But, how do you do that if you don't have a metal container? Or any container at all? With a rock of course.
Providing clean water is an integral part to any effort to raise third-world living standards. Solvatten, a Swedish-designed water purifier, does its job using nothing but a couple of hours in the sun.
A bit like Dean Kamen's miraculous water distiller, only not quite so fancy or miraculous, is the WaterMill drinking water collector. It's basically a clever dehumidifier that collects airborne water and filters and purifies it with an ultraviolet sterilizer, providing you with up to 3.2 gallons of water per day. And…