or go all in, and establish a world government. I think a single governing body is the only true way forward for humanity, if humanity is to move beyond earth and be a space faring civilization.
Talking of space faring .. according to https://en.m.wikipedia.org/wiki/Indian_Space_Research_Organi..., the Indian Space Research Organisation budget of 11,538.26 crore (US$1.7 billion)(2019–20 est.) would buy a lot of water infrastructure, but that's obviously not as exciting as going to Space..
All the infrastructure you can built won't solve the fundamental problem: humans are taking water out of the ground faster than it can be replenished, and there are more of them taking more and more water each year. Eventually the train will plow through the buffers...
ISRO provides and interprets a lot of meteorological data crucial for the agrarian economy of India amongst other things. ISRO is mostly focused on activities that benefit India in the now(launching higher resolution meteorological satellites/cooperating with EU on launch vehicles) vs countries like the US/China that focus on the future(spacelabs/spacex/mars mission etc)