Just a couple of items--Here is an interesting article that shows the lack of water. fisherman or farmers. and this is what happens when there are water shortages.
Most people cringe at the thought of drinking purified sewage, but it happens all the time. The Boulder CO Wastewater PLant discharge above the Lafayette and Louisville water plant influent structures. And really, the lower Mississippi has accepted sewage from all across the US. It really can be safe. I can think of many citites who receive drinking water from wells who are contaminated with Chromium, TCE, PCE, asbestos, nitrates, etc. but these are treated and removed before consumption. Not that big of a deal. IF DONE WELL.