I feel like an idiot for asking, but I've searched everywhere (outside of this forum and within it) and tried everything I can think of yet still cannot figure out how to fill empty bottles. Can you only fill bottles at certain places... is there a key you press? I'm trying to use the fountains at the theater and all I can seem to do is drink. Thanks in advance : )

Ah, I figured it out actually. In case someone else wants to know, you can only fill bottles at certain locations... drinking fountains won't work.