"Neither in developed or developing countries is there a physical scarcity of water. The problem is lack of infrastructure, and more importantly, the lack of management. And those are things that are bad in both the developing and developed world."
Furthermore, treating droughts with water rationing actually makes the problem worse:
http://mises.org/library/clean-water-scarcity-and-market-pri...
"In the case of droughts government monopolies set prices arbitrarily and this sends consumers distorted prices. Just as bad crops increase the price of oranges so should droughts increase the price of water. Individuals then internalize their decisions to make best use of the scare resources — their own finances and the water commodity. Government distorting prices prevents individuals from acting most efficiently to conserve scarce resources."