In Tamil Nadu's Madurai, 43-year-old Shankmukham Nath is the bearer of good news for locals in Nehru Nagar. As he honks, it signals the arrival of water, costing Rs. 10 for 15 litres. For a water starved colony, he is a saviour. "Corporation water tanker comes here once a week, every Sunday evening. But SM Waters comes here twice every day. That's where we buy our water from," says Mohammad Afreeth, while helping his family fill water pots.