How can we design a portable rain harvest system for rural areas?

[suyoj1]

Hey Guys!
I'm trying to design a portable rain harvest system for my capstone class. My project target is rural areas where people don'y have good water system. I'm thinking of making a system which collects a rain water and purifies it. Your ideas and suggestions will be appreciated.

 

[Allenman]

This is the simplest design I can come up with:

Inside it would act like a greenhouse, evaporating the water. The water would then condense on the inside of the plexiglass and run down the incline via gravity and drip into the clean water reservoir.