This is what we do, in the morning: run them in and tie, blow out dirt, rinse, morning hair product, blow out and feed, pull pans after about a half hour. Afternoon, blow, rinse, blow out, offer water, tie standing with head up for about an hour, prior to kick out "just before dark" work hair, sheen, blow, kick out, feed grain and hay, fresh water available all night. the calves will adjust to drinking water, just like a cow in a pasture they will drink in the morning, go out and graze all day, then drink again in the evening.
If you feed hay where you tie them it becomes a mess in a hurry.