Due to saline conditions, drinking and pure water is a major problem in coastal areas. Most of the open wells and tube wells in the coastal areas contain salty water. Rainwater harvesting is a viable option for solving the issue of drinking water. Construction of rainwater overhead tanks is a costly affair and marginal farmers cannot afford it. Moreover the tank has limited capacity for storing water. The method developed by Mr Antoji from Kerala, India is a cost effective method for harvesting rainwater in coastal areas. Rainwater is collected from the roof tops of houses and stored in a pressure tank in the ground and with the help of PVC pipes. The water is retained in the underground water column and this harvested water can be subsequently collected by a simple piston pump or motor before mixing with saline water. The water thus harvested is used both for drinking and for minor irrigation. He has installed more than 150 tanks in different parts of Kerala including in his home village of ‘chellanum’ in Ernamkulam district.