There's several of them on the market. People with Persian cats use them because a Persian's short face means a sopping wet chin every time they take a drink. There's a link below to one site you can buy them at. I think you'd be better off, though, just making your own. You could use one of the metal with spring bottle holders for inside the cage and use glue or Velcro strips to attach it to a wall. Some of these look like a ferret could easily knock the bottle and make a huge mess - as we all know they're so good at doing ;) http://www.bottlebabies.com/ Laura and Percy the Persian [Posted in FML 6305]