Update: I bought a Drinkwell on eBay last week and it came today! Hanna is fascinated by it - she just sits in front of it and stares at the water. I was hoping that by getting her a fountain, she would leave me alone in the bathroom, but no such luck. She will tear herself away from the fountain long enough to follow me into the bathroom and harass me in there.

She likes playing in it. Abby likes it too, but I am keeping the normal water bowl out for Bo - he's a little suspicious. Thanks for all the advice, and Hanna thanks you too! She thinks it's the greatest thing ever!