It probably depends alot on the climate, the time of year, and the temperature. I would be hard to say that they drink a certain amount a certain number of times a day.
I'd say that answer is right about on. I remember once meeting up with another hunter who told me that deer don't drink water at all -- that they get all the H2O they need from the plants they eat. If that's true, I guess all the photos I've seen of deer drinking water were actually of deer pretending to drink water. [;)]
Deer do drink water, but where water is abundant it does not factor into their daily movements. In the northwestern Pennsylvania climate, we get plenty of rain -- especially during hunting seasons. There is a creek running through every valley, and trickles coming down every hillside. It would be virtually impossible to pattern deer by their use of water. There's "water, water, everywhere," and every drop is drinkable.
I imagine D&DH has done an article on this in the past, might be a good time for them to do a refresher like they did recently with the deer calling article....
I don't remember ever seeing an article like that, so I'd like to see that one written, too. There is no doubt that deer get plenty of water from vegetation, especially when there is dew (or even frost) on the ground. So, around here, they're not making a bee-line to a water source at a particular time of the day.