Mouthwash liquid dispensing system

A mouthwash dispensing system comprising: a bottle with a threaded neck (150) defining an opening (140) and configured to hold a liquid; a dispenser (340) comprising a receiving orifice (380) and a receiving protrusion (390); and a spring-actuated adapter, comprising: an adapter orifice (250); a valve stem (220, 260) comprising a spring (270) and a seal (280), wherein the spring (270) is configured to bias the seal (280) to move the spring-actuated adapter to a closed position; a threaded adapter (230) configured to couple the spring-actuated adapter to the threaded neck (150); and a friction-fit adapter configured to couple the spring-actuated adapter to the dispenser (340); wherein, when the spring-actuated adapter is coupled to the dispenser (340), the receiving protrusion (390) moves the spring-actuated adapter to an open position to allow the liquid to flow from the bottle through the adapter orifice (250) and into the dispenser (340).