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IT depends on how high you are. High mountian bucks can get all the water they need from the water in the plants they eat and dew in the mornings so water holes may not be the best best. Like i said all depends on location. I would recommend reading a book by David W. Long calledPublic Land Mulies the Bottom Line. Very good read and gave me alot of good info.
Oh, the title made think of a different SPOT, sorry....... that's for a different thread.
Take into consideration that Mule deer can go without water for quite some time because they can get a good enough amount from the plants they eat depending on where you are at... If you want advice you should give a general area....