The hand cranked Vaccum pump, drawing water up 1m, will turn river or sea water into pure water vapour. Removing all salts and contaminants. The village will thus gain access to free unlimited drinking water from a stream or the open sea.
Using a telescopic stand one metre high, a hand powered Vacuum pump, and a of water tube. Donated by the first world. They can fill a jug for their own use.
Or a little plant can fill a water tank for the village during the day. No high pressures. Which are expensive and dangerous. Be just suck to water out of the river or sea.
This is such a simple idea. High school physics. But it could says so many lines. Sheffield University could give it as a Wednesday afternoon practical, by the first year engineering undergraduate students.