When I got Possum a few weeks ago, I didn't know if she knew how to use a bottle (she was 9 weeks at the time) and so I purchased a bottle as well as a shallow bowl. She took immediately to the bowl, and evidence is there every morning that she has used it -- there's bits of food in it. When I bring her to her dish she grabs on to the edge and laps up water like a dog. I would suggest giving that a try -- she doesn't need much water, but I do change it every night when I feed her.