A liquid spray dispensing system has a liquid container receivable within a housing, provided in separable housing portions. The liquid container has at least one flexible side or end wall or a slidable end wall, movable by an actuator, to reduce the volume of a liquid storage compartment containing the liquid to be dispensed through a spray nozzle unit operably connected to the liquid storage compartment. By operating the spray nozzle unit, or a switch operably connected to a spray actuator of the spray nozzle unit, the actuator moves the flexible or slidable wall to reduce the volume of the liquid storage compartment, and thereby cause the pressurized liquid to be dispensed through the spray nozzle unit.