This summer the Himalayan town of Shimla literally ran out of water. But this is not the only town to confront this crisis. According to the 2018 Composite Water Index of the NITI Aayog, 600 million people — roughly half of Indians — face high to extreme water crisis; worse, 70 per cent of the available water is contaminated. And by 2020, Delhi, Bengaluru, Chennai and Hyderabad will run out of groundwater and by 2030, as much as 40 per cent of India will have no drinking water.