A portable fresh water supply apparatus for providing continuous fresh water to an animal when a caregiver is absent includes a reservoir capable of receiving and dispensing fresh water and a water supply line in fluid communication with the reservoir. A shut-off valve is located within the reservoir and is in fluid communication with the water supply line. A water drain line is in fluid communication with the reservoir, and an over-flow drain valve is located exterior of the reservoir as well as in fluid communication with the water drain line. In this manner, when a water level inside the reservoir reaches a threshold level, the shut-off valve is automatically toggled between open and closed positions and thereby selectively supplies fresh water from the water supply line to an interior of the reservoir. The overflow drain line diverts excess water away from the reservoir.
