I've tried to put a small bowl under the waterbottles, but the piggies knock it over.
Thankfully though now I have waterbottles that NEVER leak and I don't have to put anything under them except a tide more bedding. It helps a bottle not to drip if you fill it up all the way with water.
I not only use waterbottles, but I also use water bowls. The piggies drink water from both. I have noticed that some like drinking out of the bowls more than the water bottles.
Variety is the spice of life!