Hi Banto, thanks for the feedback - it's always welcome.
The way drinking currently works (and if it doesn't, please let me know as it's a bug)
The well produces one bucket of water, which can be used in recipes*
The bucket contains 10 portions of drinking water which can hydrate 10 hearthlings.
*Berry juice recipe contains 10 portions of berry juice which can hydrate 10 hearthlings.
Normal berries and prickly pears can be 'eaten' for 1 portion of juice which can hydrate one hearthling.
I'll take another look at the thirsty thought bubble, although I can't see anything wrong after a quick glance. It's an exact replica of the hungry thought bubble.
I'm the thirst to admit (get it? bwuahaha) the drinking concept still needs a little work. Unfortunately I'm limited by game mechanics at the moment. The good news is that I managed to chat with Yang while I was at Pax, and hopefully the mechanic will be in eventually.