The average fluid intake for cats is 60ml (2.02 fluid ounces) of water per kilogram/pound of body weight per day.

Can a Cat Drink Too Much Water? 

Cats drink an average of 60ml (2.02 fluid ounces) per kg per day, and a larger volume than that should be considered as polydipsia.

Polydipsia in cats can be a result of many things. It is important to rule out the reason for its occurrence when your cat shows signs of polydipsia in order to establish an appropriate treatment plan.

The Common Causes of a Cat Drinking Excessive Water