Try the "Cat-It" water fountain. Our cats LOVE to drink from it. I've tried
numerous pet drinking fountains, and this one clogs the least and is easiest to clean.
This looks like the one I have. the prices seem to vary; I guess they come in different sizes.
Amazon.com: Catit Fresh & Clear Small Drinking Fountain: Pet Supplies
Catit Fresh & Clear Small Water Fountain | | The Cat Connection
My cats love drinking from these!
I've learned that they love the drinking fountains that have the water stream "air-born" but those also clog and slow down VERY quickly. These Catit fountains have the water running constantly over a piece of curved plastic. Less pump power is needed, and therefore they don't slow down and peter out so easily.
It really encourages drinking.