Hello again!! I feed only wet food, which has a good amount of moisture already in it, so the cats do not drink that much water from the bowl. However, if I notice a cat drinking lots of water, then that is a signal for me that something might be going on. Subcutanous fluids, aka, sub q fluids, are given under the skin of the cat, usually in the scruff of the neck area. I have 3 kidney cats who a hydrated via sub q several times a week, they are NOT thrilled to have a nurse for their Mom. It is not that difficult to do, I have even taught my husband how do give the fluids!! Perhaps your kitty is not that bad that the fluids are needed. Trust me, your vet would have let you know!!!