Your suggestions sought for water purification solution in earthquake affected villages in Nepal.

Hello all  My friend in Nepal has sent me this query, I wonder if any of you can help with suggestions for appropriate solutions.  "I'm searching for an organisation that can give me professional information on water filter systems which could purify a water source for an entire village. We have a water source that gets contaminated by dead bodies, so we need immediate solutions to protect the villagers.  Any immediate solutions are most welcome. Many thanks .