How to conserve rainwater - Well in the house is dry during peak summer

Greetings to the entire Team.

You guys are doing a brilliant job. I have a two storey villa in Kerala. We get plenty of rain during the monsoons but that holds no help when the sweltering heat of the summer comes in. The well at our villa runs almost dry during peak summer. I am looking for simple ways as to how we can conserve water in simple cost efficent methods.