Brand new to this. I have three beautiful young hens, who seem quite at home in their new coop/run. They are eating well and seem to be adjusting nicely to teir new home, but I haven't seen them drink yet! We did the 5 gallon bucket in a shallow pan, homemade feeder. They approach the pan but will not drink. Should I be worried? My father says when they get thirsty they will drink.