Disclosed is a method and device for providing water to livestock during transport in a trailer that is being towed behind a vehicle. In the disclosed embodiments, each stall of the trailer is equipped with one or more transferable animal transport watering assemblies that allows each animal to have their own on-demand access to water. Each watering assembly is releasably mounted with a quick release bracket and quick-connect pressurized water supply, facilitating easy transfer of the watering assembly to an external mount point on the trailer so that the animals have continued access to the water supply when the trailer is parked.