A liquid dispensing device having a conduit with an upstream end and a downstream end a housing with a first end and a second end, wherein the first end is open and the second end forms a flat substrate and wherein the housing is adapted to receive a vial, said vial containing a liquid and having a stopper a piston, wherein the piston exerts pressure on the stopper a needle that is inserted through the stopper and provides fluid communication between the interior of the vial and the upstream end of the conduit, such that the needle defines a channel through the piston and a valve for releasing a liquid into the upstream end of the conduit, wherein the valve is biased closed until actuated by a user and wherein the valve is located downstream of the housing.
