I don't see water as being a big problem, once they figure out decent mass desailinization techniques, we're fine. We are in much more danger of alot of other resources. Ozone/atmosphereic concerns are much bigger on my list (and believe me, Im no tree hugger), but vegetation creates 30-40% of the breathable atmosphere, and ocean plankton does alot of the rest. More people= more living space = less natural areas + greater resource consumption. The root of the problem is population. Mother nature senses these things every so often and throws out an antibody to help with the problem. Aids is a good example, get the virus in its reproductive cycle.
You can either stem the problem off by enforcing limited breeding programs. I am of the opion that every girl, once they reach breeding age should be given Norplant implants yearly until they reach the age of 21, then there should be a child cap based on income. It's not perfect, but it stems the problem. The issue comes in when you consider civil liberties. I think that to ensure the survival of the species, certain civil liberties need to be suspended. A couple hundred years of controlled breeding, and we should be ok again. Its a well known fact from population studies that as areas become more densely populated, aggressive tendancies become more pronounced.
The world needs to do something to buy itself some more time...
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