Nanotech tea bag creates safe drinking water instantly, for less than a penny.
A new “tea bag” uses nano-fibers to suck contaminants and bacteria out of water, providing a desperately-needed, cheap solution for the billions of people without clean drinking water.
Pronoia Resources 
Here is a link to one article about this, since the link in this post is not working right:
http://io9.com/5611927/nanotech-tea-bag-creates-safe-drinking-water-instantly-for-less-than-a-penny
Fixed – thanks for letting me know!