How Much Water Should a Cat Drink Per Day?
A simple weight-based rule plus three cheap tricks to keep cats hydrated.
Cats are famously under-hydrated. A weight-based target and a few environment tweaks fix most of it.
The rule of thumb
Most cats need roughly 40–60 ml of water per kilogram of body weight per day — about a cup for a 4–5 kg cat — and wet food can supply most of it.
Vet warning: A cat drinking dramatically more (or less) than usual for more than a day or two can signal kidney disease, diabetes or a urinary blockage. Measure water intake and tell your vet.