just get a couple of heavy ceramic bowls - it they're heavy enough the cats won't be able to knock them over then they're be heavy enough that they won't knock them around a whole lot.

maybe get some kind of rubber (rubberized) mat - something with sides, you know? because the cloth one is no good. but something non-skid enough to keep the bowls from sliding around a lot might be good. and it's nice not to have a whole lot of catfood all over the bathroom floor. or, it would be nice.