We have nearly infinite water right off all coasts of every coastal country. All it takes is energy to remove the salt. And surprisingly little energy, too. It takes less energy to desalinate at the Carlsbad California desal plant than it takes to transport fresh water from the Sacramento River to Carlsbad. Every country in the zones that are short of fresh water have adequate ensolation to use PV panels and reverse osmosis or solar distillation facilities to supply fresh water to every citizen, farm, industry, etc.
That "running out of water" myth is really "running out of easy water", as in a river running through the center of town. Fortunately, we humans have technology we can use. We don't need to stick out faces in a stream to drink.