Funny, how this discussion shows me how greedy germany is. We only get bottled water here (or from the sink, which, in a toilet in a german zoo is... well...) and that bottled water costs a fortune. One Restaurant in Zoo Hannover had water (even sparkling water) with one pay and free refills and that felt so generous...
I'm not against water fountains in the game of course, just saying that for us germans it will be so natural to use them as it is using weird pzza wending machines.
I remember almost dying in Gondwana (tropical hall in Zoo Leipzig), because they had no water anywhere and if I remember correctly not even a chance to buy drinks. I was sure I'd pass out. Made it to the exit somehow, but it was almost a traumatic expirience. (The Zoo and Leipzig was in general, the ableism was.... shocking to say the least.)