I rarely see drinking fountains (assholes use these as ashtrays) but there are public taps with drinkable water, mostly outside in touristy places. I remember using one in Brno!
My friend is like that. We used to try to guess the size of things for fun when we were younger. He was really bad at it. One day we were talking about tigers. He said: "how big do you think a tiger is? Prolly like six meters, idk"
Australians can be really creative!