Can you fill only one bottle there a day, or can you fill however many you want as long as they're open?

However many you damn well please as long as its open. That I know of. You should give it a try to see if you can reach a limit XD

Okay, cool, lol. :P I just have a couple of bottles to fill for my Aeanoid's TC, since the empty versions are so much cheaper than the filled ones. Thanks! :)