Drink water problem

It could be a large problem.

KDI said:

Here's a pictorial representation of the facts around water that kind of woke me up to the problem we're all facing: http://1.usa.gov/MB28XE ; Limits to freshwater could restrict economic growth by impacting society in four primary ways: (1) by increasing mortality and general misery as increasing numbers of people find difficulty filling basic and essential human needs related to drinking, bathing, and cooking; (2) by reducing agricultural output from currently irrigated farmland; (3) by compromising mining and manufacturing processes that require water as an input; and (4) by reducing energy production that requires water. As water becomes scarce, attempts to avert any one of these four impacts will likely make matters worse with regard to at least one of the other three. 

I commented:
There are many ways to save drinking water. In Hong Kong, some buildings use sea water to flush the toilets. Under some controlled environment you can use minimum water to grow plants - it is not economical now as we still have a lot of water. Limit population growth. Reduce some mining that requires a lot of water.  

India could be the country to suffer more. China has projects to re-direct southern water to the north. They will not do it in large scale unless they have to.

South China suffers from too much water and the north from too little (a recent exception in Beijing). The west is a semi desert. Water could be more important than we expect. Shipping water from Africa is a long way, but we also shipping bottom water from all over the world.