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.
I've spent countless hours either on my hands and knees or bent over, messing up my back, looking for blood. One such instance I remember most was a hog hunt a few years ago in Mississippi. I had never shot a hog so when I poked a hole in this guy; I was determined to find him. Wearing snake leggings, I crawled on my hands and knees through the briars and the brambles and bushes where a rabbit wouldn't go. I found a spot of blood here and there but never the pig. And lucky for me, I didn't find...