The LifeStraw, from Danish company Vestergaard Frandsen, may be the best hope yet for the 1.1
billion people worldwide who lack access to safe drinking water. The 3.4-ounce â€strawâ€ can filter up to 185 gallons of water, enough to supply one person for a year. Just dip the plastic tube into water
and suck on it to draw liquid up through three filters. Two textile layers remove dirt, iodine-based resin kills 99.3 percent of bacteria and viruses, and activated carbon catches whatever the iodine missed.