I am new to raising bottle calves. I have had some for a month now and they seem to be growing well, eating grain and hay, but I have never seen them drink their fresh water. I change it often but it never has traces of anyone drinking it. I tried to show them it was there by dipping their noses in it.They weren't impressed. Will they learn to drink eventually without a mom, will they not drink water while on the bottle? They see the older cows drinking, but don't seem interested?