Hi! A sure-fire remedy for cat cystitis is unsweetened cranberry juice, fresh-squeezed lemon juice & water. 1 cup cranberry (unsweetened!!), 1 cup fresh-squeezed lemon juice & one third cup water. I administered 1tsp. doses by syringe every half hour and Daisy-Mae was cured within 6 hours after battling cystitis for months!!! YEAH! She would allow the syringe "feedings" because she knew it was giving her almost instant relief. I had tried everything... ACV, antibiotics, etc. This recipe worked like a charm and it is all natural! Love it.