There is a product called "The Lifestraw", which purifies the water before it reaches the lips.
Yes! The aptly-named LifeStraw is an invention that could become one of the greatest life-savers in history. It's a 25 cm long and 29 mm diameter portable water purification tool that cleanses surface water and makes it safe for human consumption. The plastic pipe requires no electrical power or spare parts and costs just a few dollars. It can easily be hung around the neck.
The pipe filters up to 700 litres of water—approximately one year of water consumption for one person and effectively removes most of the microorganisms responsible for causing waterborne diseases--diarrhoea, dysentery, typhoid, and Cholera.
The invention has been tested by independent and qualified research laboratories and found extremely effective. It contains PuroTech Disinfecting Resin (PDR) - a patented, extraordinarily effective material that kills bacteria on contact.
Swiss-based Vestergaard Frandsen designed the filter for people living in developing nations and for distribution in humanitarian crisis. LifeStraw was distributed in 2010 Haiti earthquake, 2010 Pakistan floods, and 2011 Thailand floods.
If WE can find a way of distributing one of these to each human at risk, every year, we could save countless lives. A simple straw costing a few dollars will ensure that one at-risk person will not die for a year.
Source: www.gizmag.com and Wikipedia