How do I stop my cat from spilling water all over the floor?

I have a 6 month old kitten and she loves to stick her paw in the water dish. My dish has a water jug on top and it dispenses water in as needed. But my cat loves to tip it over and splash around in it and I always find water all over the floor. I never catch her when she does it and I don't know how to make her stop. I'm getting really frustrated and help would be appreciated.