This is a FWIW anecdote...in the fall of 2012, following the extreme drought of the summer of 2012, there was precious little water to be found anywhere on our farm. I don't think there was a drop of water to be found in the creeks on our property, etc, and I know that myself and others were concerned that there was so little water available for the wildlife that it might impact them.
When the bow season started that fall it was still bone dry out there and we theorized that a very deep, but small pond that we had up in the timber would be a hotspot. Our logic was that the deer had to be using that pond, it was really the only water within a 1/2 mile of that area of the timber.
Well my son did shoot a very nice buck that day on our first day of hunting for the year AND he was sitting about 15 yards from that pond...BUT the deer he shot came up out of the timber and walked right next to the pond and never took a drink. We both thought that was strange, but maybe he just wasn't thirsty.
Deer did water at that pond, but no more than what they seemed to do in other years and it certainly was not as if he was sitting on a water hole in the US West or Africa or anything.