thirsty or not ?
The volume of drinking water needed by an individual cat each day varies according to its size, the weather and if their diet includes wet food, or is dry food only. Also, diseases like hyperthyroidism, diabetes and kidney disease all substantially increase the need.
If needed, one way to get cats to drink more is to provide running water – in the form of a running tap, or a drinking fountain perhaps – which is naturally enticing to many cats.