Drinking water supply apparatus

Moveable apparatus for drinking water supply, said apparatus comprising a drinking water tank, a supply pipe connected to said tank, a three-way valve connected to said supply pipe leading to said tank, said valve having first and second inlets, said first inlet being connected to a fresh water intake connectable to a fresh water source, a return pipe connected to said tank and leading back from said water tank to said second inlet of said valve, a circulating pump in the water circuit formed by said return pipe and said supply pipe, a filter provided in said supply pipe, a silver ion admixing unit provided in said supply pipe downstream of said filter, a flow meter provided in said supply pipe by means of which it is possible to control the silver ion delivery rate of the silver ion admixing unit as a function of the flow rate, and a control device for switching over said three-way valve for closing said first inlet and opening said second inlet of said valve and subsequent connecting in of said circulating pump on reaching a maximum filling level in the water tank.