Small water treatment system for household water purification

Myself Arunodoy Sarmah. I am working as officer with a psu bank in Assam. I would like to enquire about a small water treatment plant at my home in Guwahati. During winter months we face water shortage issues here in Shantipur hillside area in Guwahati even though we are hardly 5 km from Brahmaputra river. We have 8 families at rented accommodation here and daily water consumption is near about 4000 to 5000 liters. Please guide me through your valuable suggestions.

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