A filling device for filling at least a first reservoir of an applicator with fluid from at least a first container, the filling device comprising: a first container holder with a first holding area which is designed to hold a first container on the first container holder, the first container holder having a first outlet opening and a fluid channel between the first holding area and the first outlet opening in order to remove a first fluid from the first container through the first outlet opening; and an applicator holder with a fastening area which is designed for removably fastening an applicator to the applicator holder along a fastening direction, the applicator holder having a first inlet opening and a first fluid connection between the first inlet opening and the fastening area in order to take up the first fluid into a first reservoir of the applicator through the first inlet opening; wherein the first container holder is configured to be connected to the applicator holder along a first connection direction in such a way that the first outlet opening and the first inlet opening are in communication with each other, and wherein the first connection direction is transverse to the fastening direction for the applicator, characterised in that the filling device comprises a second container holder with a second holding area which is designed to hold a second container on the second container holder, wherein the second container holder has a second outlet opening and a fluid channel between the second holding area and the second outlet opening in order to remove a second fluid from the second container, wherein the applicator holder further has a second inlet opening and a second fluid connection between the second inlet opening and the fastening area in order to take up the second fluid into a second reservoir of the applicator through the second inlet opening, wherein the second container holder is configured to be connected to the applicator holder along a second connection direction in such a way that the second outlet opening and the second inlet opening are in communication with each other in order to create a connection from the second holding area to the fastening area of the applicator holder, wherein the second connection direction is transverse to the fastening direction for the applicator. a first container holder with a first holding area which is designed to hold a first container on the first container holder, the first container holder having a first outlet opening and a fluid channel between the first holding area and the first outlet opening in order to remove a first fluid from the first container through the first outlet opening; and an applicator holder with a fastening area which is designed for removably fastening an applicator to the applicator holder along a fastening direction, the applicator holder having a first inlet opening and a first fluid connection between the first inlet opening and the fastening area in order to take up the first fluid into a first reservoir of the applicator through the first inlet opening; wherein the first container holder is configured to be connected to the applicator holder along a first connection direction in such a way that the first outlet opening and the first inlet opening are in communication with each other, and wherein the first connection direction is transverse to the fastening direction for the applicator, characterised in that the filling device comprises a second container holder with a second holding area which is designed to hold a second container on the second container holder, wherein the second container holder has a second outlet opening and a fluid channel between the second holding area and the second outlet opening in order to remove a second fluid from the second container, wherein the applicator holder further has a second inlet opening and a second fluid connection between the second inlet opening and the fastening area in order to take up the second fluid into a second reservoir of the applicator through the second inlet opening, wherein the second container holder is configured to be connected to the applicator holder along a second connection direction in such a way that the second outlet opening and the second inlet opening are in communication with each other in order to create a connection from the second holding area to the fastening area of the applicator holder, wherein the second connection direction is transverse to the fastening direction for the applicator.