A kitty water potty training apparatus includes a base configured to be supported on a ground surface, a plurality of exterior platform members removably engaged with an exterior surface of the base, a plurality of interior platform members removably engaged with an interior surface of the base and terminated beneath the exterior platform members, respectively, a large reservoir configured to receive and contain cat litter and is removably nested within the base, and a small reservoir assembly configured to receive and contain both cat litter and water therein and is removably nested within the base. At least two portions of the small reservoir assembly are selectively interchanged from the base. The small reservoir assembly and the large reservoir are configured to simultaneously contain cat litter while the small reservoir assembly also contains water.