I will be going back to India in July and y main concern is the bad quality of water there. It gets worse in summers, as the rainy season starts and all the infection-causing microorganisms begin breeding in water. The basic method which I religiously use for water purification, is to boil it for fifteen minutes. But when the water gets murkier you may have to add either chlorine or iodine tablets in it. I remember when I worked as a volunteer during the 1998 flood in my state, we used to distribute bleaching powder in the flood hit areas so that people don’t contract water-borne diseases.  That was a very crucial time because, during such periods epidemics spread very quickly. But luckily nothing major happened. Another way to get safe drinking water is to use water purifiers marketed by different companies like EcoQuest Intl, which has been in this business for many years.