Filling device (110, 210) for a bottle which is closed in an air-tight manner, having a bottle adapter, a container adapter and a storage container, wherein the bottle adapter is connectable at least indirectly to the bottle in order to introduce a liquid from the storage container which is provided with the container adapter and is at least partially filled with liquid, wherein provided between a liquid output port of the container adapter and a liquid input port of the bottle adapter is a sealed liquid communication connection and provided between a gas input port of the container adapter and a gas output port of the bottle adapter is a sealed gas communication connection, wherein - an indirect releasably fixed plug connection between an adapter block of the bottle adapter and an adapter body of the container adapter is achieved in that a liquid communication connection between the bottle adapter and the container adapter is configured as a first sealed flexible hose, on the one hand, and a gas communication connection between the container adapter and the bottle adapter is configured as a second gas-tight flexible hose, on the other hand, and wherein - the internal diameter of the first hose is sized to be larger than the internal diameter of the second hose, and wherein - the liquid output port and the gas input port of the container adapter are in each case configured as pipe end pieces with defined external diameter of a robust mechanical unit which is configured as the adapter body, characterized in that - a pump is provided for pumping liquid from the storage container into the bottle, wherein - the pump is configured as a hollow cylinder which is provided in the region of a closed lower end face with a check valve, a piston which is connected to a piston rod and mounted so as to be able to reciprocate in the hollow cylinder being introduced into the open upper end face of the latter, wherein a bore which leads through the piston and the piston rod forms a liquid communication connection from the interior of the container to the container adapter and a gas communication connection, which is configured as a hose, leads from the container adapter into the interior of the storage container, and wherein - provided is a helical spring, the one end thereof being supported in the region of the surface of the storage container and the other end thereof being contiguous to a detent attached to the piston rod, so as to guide the piston rod and thus the piston, after the piston has been transferred from a neutral resting position in the direction of the closed end face of the hollow cylinder in the context of a pumping procedure, back to the neutral resting position. - an indirect releasably fixed plug connection between an adapter block of the bottle adapter and an adapter body of the container adapter is achieved in that a liquid communication connection between the bottle adapter and the container adapter is configured as a first sealed flexible hose, on the one hand, and a gas communication connection between the container adapter and the bottle adapter is configured as a second gas-tight flexible hose, on the other hand, and wherein - the internal diameter of the first hose is sized to be larger than the internal diameter of the second hose, and wherein - the liquid output port and the gas input port of the container adapter are in each case configured as pipe end pieces with defined external diameter of a robust mechanical unit which is configured as the adapter body, characterized in that - a pump is provided for pumping liquid from the storage container into the bottle, wherein - the pump is configured as a hollow cylinder which is provided in the region of a closed lower end face with a check valve, a piston which is connected to a piston rod and mounted so as to be able to reciprocate in the hollow cylinder being introduced into the open upper end face of the latter, wherein a bore which leads through the piston and the piston rod forms a liquid communication connection from the interior of the container to the container adapter and a gas communication connection, which is configured as a hose, leads from the container adapter into the interior of the storage container, and wherein - provided is a helical spring, the one end thereof being supported in the region of the surface of the storage container and the other end thereof being contiguous to a detent attached to the piston rod, so as to guide the piston rod and thus the piston, after the piston has been transferred from a neutral resting position in the direction of the closed end face of the hollow cylinder in the context of a pumping procedure, back to the neutral resting position.