A water filter assembly for a beverage dispenser. The water filter assembly may generally include filter media positioned within a filter housing which may be attachable to a first fitting or a second fitting of a water storage reservoir to provide filtered water to a reservoir outlet. The filter housing includes an adapter sleeve that defines mounting features that correspond with the first fitting and the second fitting to enable the water filter assembly to connect to either of the first fitting or the second fitting. In this manner, a single water filter assembly may be used in beverage dispensers having different reservoir fittings.