We've already written about the LifeStraw, a product that could save the lives of the 1.5 million under-fives who die each year from drinking untreated water, and here's another. Developed by an Israeli company called Water Sheer, the Sulis personal water purifier (named after the Roman goddess of spring water) is a 2.7-inch, 10-gram device which you attach to the top of a bottle of water to drink through.

As well as helping people in the developing world, the device, which can purify water tainted by organic, biological, and chemical contaminates, is also aimed at hikers, victims of natural disasters, and the military. The company is looking for investors in order to build a manufacturing plant and start production, but they say the device, which is good for purifying 1,000 liters of water and, unlike other purifying devices makes the water taste like, well, fresh water, will cost no more than a "large coffee and cake at Starbucks".

Product Page [Watersheer via MedGadget]