India is not facing a "Water Apocalypse".
Salt water infiltration into groundwater and soil is a harder problem to solve.
Urban/rural India has no system whatsoever to manage water.
The problem is that without some sort of stick, nobody is going to do anything about it and the stick is almost here.
This problem will resolve itself in time, anybody who has been even slightly forward looking would have already invested in water conservation.
Sea Level rise and salt water infiltration in agri land is much more concerning though.