A liquid dispenser for dispensing a consumable liquid from a container. The dispenser includes a cabinet configured to receive one or more containers in an inverted position such that liquid is induced by gravity to flow out of an open interior of the container though a dispensing opening. A positive pressure valve assembly is mounted to the dispensing opening of the container prior to insertion of the container into the cabinet. The valve assembly includes a cap connected to the dispensing opening and a discharge tube extending from the cap. A flow restrictor of the valve assembly is positioned to selectively open and close the discharge tube to control the flow of liquid from the container. A one-way valve is positioned between the open interior of the container and a supply of air. The one-way valve allows air flow into the container as the fluid is discharged to maintain a positive pressure within the container.

A system includes a carousel apparatus, a support structure configured to hold a receptacle, and a linear actuator apparatus configured to move the support structure. The carousel apparatus includes: a holder in which a first plurality of openings and a second plurality of openings are formed, and a first motor coupled to the holder and adapted to rotate the holder around an axis. A linear actuator apparatus includes: a linear guide which extends underneath the holder and is coupled to the support structure, and a second motor coupled to the linear guide and adapted to move the support structure along the linear guide underneath the holder.