I'm from Wisconsin and knew quite young that milk came from cows--from those things on the bottom of their tummies. Somehow I assumed that our water came from horses! Perhaps I'd seen one "making water" in a field and then drew that conclusion?
A childhood belief about general

others believed things like this
- I used to believe that milk came from cows, so water came from horses. hahah— Melissa O'Connor
- When I was little I thought cows married horses, cows were all female and horses were all male. — Sheila
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic
- I used to believe chocolate milk came from brown cows and regular milk came from black and white cowsAnon
- When we were little my sister thought if you mixed cow’s milk and water you’d get goat’s milkAnon
- i used to think chocolate milk came from brown cows and normal milk came from white cows Anon