I mean, unless your toilet is super nasty or you never flush, toilet water is actually pretty clean. Your tap water and toilet water come from the same place.
haha if your cat could open up the faucet she probably would..cats like flowing water, maybe if you get yourself a cat-fountain, she will stop drinking from the toilet
Maybe you can get a kids potty training chair and use that as your cat's drink bowl? Let your cat watch your swirl it so your cat can see movement and *hopefully* will drink out of that instead. Good luck!
Cats like to drink from water that's moving. There's bowls that cycle the water, maybe try that?