A filling device for filling containers with a liquid has a first port for supplying a first liquid to the filling device, and a second port spaced from the first port for supplying a second liquid to the filling device. A mixing chamber within the filling device includes a first liquid channel which guides the first liquid from the first port to the mixing chamber, and a second liquid channel which guides the second liquid from the second port to the mixing chamber, wherein the first liquid channel and the second liquid channel guide the first liquid and the second liquid separately from one another. A valve body controls discharge of the liquids from the filling device through an outlet to the container. The valve body is disposed at least partially between the mixing chamber and the outlet.