I have heard some serious talk from professionals and pundits that the next big series of war will be over access to water.
I really don't see that happening. The technology to supply water is well known and cheaper than a war with new technologies emerging.
When wars cost less than water it makes sense to have a war over water. However, as the cost of water goes down then obviously it makes less sense to go to war over it.
Saddam Hussain invaded Kuwait because oil is expensive. Saddam didn't invade Saudi Arabia to acquire large stocks of high grade silicon. In order for water to hit 140 bucks a barrel either the dollar has to massively devalue (likely) or there needs to be a severe shortage of water (unlikely).