Did you disable water storage in all storage buildings? (Stockyards, storage wagon, and storehouses)
I reported a message telling me the same thing, about a month ago.
Wasn’t a bug. I had disabled water storage in all buildings and stockyards except one- and that one was full. So there was nowhere for my villagers to put water. I built a new stockyard and enabled only water storage- and the message stopped popping up.