If you’re worried that your cat isn’t drinking enough water, look at the placement of their food and water dishes.
You don’t want the food and water right next to each other.
As carnivores, cats in the wild eat their prey and that’s a messy business. As such, their instinct is to avoid drinking from standing water near where they’ve eaten as they want to avoid fouled water that will make them sick.
I know it’s more convenient to have the food and water dishes right next to each other, but if you want your cat to drink more water… Think about putting the food at one end of the room and the water at the other.
Your cat will eat, groom, then search out water. And make sure you give them fresh water everyday and when the water gets dirty.
My cats will usually let me know if they need new water by standing next to the bowl and looking at me meaningfully while not drinking.
If your cat is stubborn about drinking water, consider feeding them wet food so they get at least some hydration. But if separating the bowls helps, that’s an easy fix.