I know this thread is a joke, but unironically the answer is yes.
As the third world (particularly Africa) continues to breed out of control, and as those low-IQ resource drains continue to spread over the world, potable water will become a hot commodity. The privitization of water sources is already taking place in parts of Africa to save the savage monkeys from themselves and profit in the process. As time goes by this will become mode and more common.
Yes, invest in companies that specialize in large-scale water purification, and PMCs that will be used to protect them.