India, Jan. 7 -- Many of us must daily consume our drinking water stored in a safe, hygienic and filtered state, reasonably fit for human consumption. Either we might have a water filter installed in our kitchen. Else, we might routinely be receiving home-deliveries of giant mineral water bottles from the local grocer.

There are also many fellow citizens who probably cannot afford filtered drinking water. Such as citizen Nirmala. She is a beggar, and throughout the day, she sits on a central Delhi market pave, seeking alms. During the day, she drinks the tap water sourced from a friendly snack vendor.

While there are places in the city equipped with water filters for the public, there aren't too many. Citizens, who are either homeless, ...