Our female cat (aged 6) does not seem to drink much! We purchased a fountain for her and she did enjoy it but now only uses it infrequently. She urinates only once a day. Currently, she is on Hill's W/D diet (we add water both to her moist and dry food) and underwent surgery a few months ago for struvite crystals. Our vet does not seem concerned but we are!! She is otherwise quite happy and eats well. Thanks so much for any suggestions!