Drinking enough water is important for cats to remain healthy. Cats are prone to urinary track illnesses that can be exacerbated by not drinking enough water. And some cats will drink less if the water isn’t fresh. The Drinkwell water fountain can help by providing water the cat is more willing to drink (the fountain process and filter keep the water from seeming stale). You will need to add water every few days but you can add it less often than if you just put it in a bowl.
And your cat might find adventurous ways to drink, like the cat in the video above.