My cat, Eddie, loves to play with his water. He was always dumping the water out of the bowl. I went to a department store and bought a very heavy, oblong shaped, Pyrex cooking bowl. The bowl is 8" long x 6" wide x 2 3/4" tall. The glass on the bottom of the bowl is almost 1/2" thick. The glass is almost unbreakable because it's Pyrex.
Now Eddie can play with the water but he's not strong enough to knock over the heavy glass bowl.
Maybe you can go to a department store and find yourself a nice bottom heavy bowl for your cat.
Pet water fountains are GREAT for this, they're big and clunky and kitty can't knock it over but can still play it in. They have them at walmart or pet stores for 20-30 bucks. My kitty plays and knocks over his water too and the fountain works wonders. They look tall but kitty can still drink from them.