LifeStraw: water purification cheap

LifeStraw is an entire purification system in what looks like a fat drinking straw.  It was designed by a Danish group to be produced for under $2 a straw in order to be marketable for the developing world where water borne diseases still kill thousands.

LifeStraw purifies water instantly for under $2 a year - Engadget - www.engadget.com.