A healthy cat will get all the water they need from their food and from a source of water. The problem is that cats can be very fussy about what they drink from. In nature, they would drink from a stream or river and that is why many owners find that the best cat water fountains are a sensible investment for them. If you do not want to use a water fountain, it is a case of finding a bowl that your cat likes.
Cats can survive for some time without eating and this can be up to a month. However, when it comes to hydration, the situation is more serious. A cat cannot go longer than a few days without water. Dehydration in cats is a serious issue that can cause irreversible kidney damage.