My pail calf story: It was my job to teach the babies to drink from a pail when I was a teenager-- and I was pretty good at it!
Then came a little heifer that just would NOT cooperate. I tried every trick in my book over two days. No deal.
Finally totally disgusted I turned my back on her and walked away,letting the pail sit there.
Turned around to see the little rascal drinking nicely and neatly from the bucket!
Guess she didn't need me.
I've had many that could drink on their own but, would rather suck on my finger while I dipped their nose or chew on me so after I figure they are pail broke and one still wants me I just leave it and find they do just like your's did.