There are three main reasons why your cat might be playing with their water.
Firstly, your cat may just like to play with the water.
Secondly, some cats only like moving water. This is because moving water tastes better due to increased oxygen content. Your cat may be moving the water around in order to improve the taste.
And finally, cats just don’t have the best vision. Cats may paw at the water to see where the level is before they drink.
You can help your cat by providing fresh water daily and considering a cat water fountain.