I have never tried it myself, but i have friends that archery hunt that have tried food plots to no avail. I'm not sure why but the mules here are more apt to be taken at a waterhole rather than at a food plot.
Mule deer will drink water where ever they find it and they don't need that much water. I have seen them drinking out of mud puddles in the middle of the road before they would drink out of the stream 10 yards away.
Once they are pressured they seem to drink at night. When I was young and trying to figure out muley's I watched them come to a water hole during the day pre hunting season. I thought I had it all figured out, but I was only 12 then. Once the season started I never saw deer at that water hole again.
Then I discovered still hunting, and never staked out anything again.
As a Taxidermist I look at hundreds of Whitetail Bucks every year. I know that I have seen many different ways people judge the size of racks on live deer. I think for the most part they all are pretty close. I'm going to give you some measurements that I have noticed being right on in just about every deer. We have used it in the last couple years and have only been off by about 5-6 inches. We do study the deer while bowhunting so we get a little more time to look at them....