The family of a senior scientist in Bengaluru has not paid their water bill for 22 years. Reason: AR Shivakumar is doing without a water connection, using treated rainwater not just for bathing and washing, but also for drinking. The senior scientist at Karnataka State Council for Science and Technology had designed his green home more than two decades ago - building in a water harvesting system that yields more than 400 litres of water daily. Which means the expected scanty rainfall this year - when the state is facing is second consecutive year of drought - will be enough for their needs.