A compact water bottle filling station for mounting to a wall and method for retrofitting the same. The station includes a frame supported on the wall by a wall hanger bracket and a basin supported by the frame. The basin includes a receptacle located between a front lip and a rear edge of the basin, which define a lateral distance therebetween. A cover surrounds the frame on at least three sides and includes a pair of opposed side panels and a front panel located there between. The front panel extends upwardly from the base of the compact bottle filling station and terminates at and underneath the basin. A backsplash extends upward from the basin, adjacent the rear edge, and has a nozzle provided therein to direct water toward the basin.