It seems every five years or so, the desperate situation around fresh water seems to creep its way back into the limelight. I've seen it pop up a few times over the past few weeks in my circles again.
As with other popular natural resources we are like frogs slowly boiling ourselves in water. The temperature increases slowly enough that we don't feel enough sharp pain to jump out; ever. In the end... you know what happens.
There are plenty of enlightening books on the water problem, but Blue Gold is my favorite.
Wars are already being fought over water, though oil captures the spotlight and the might of the US Military so far. Science and technology will eventually bridge natural water source exhaustion gaps, but it will be a rough process just as coming to terms with petroleum's global impact has been.