Abstract: Bottle mounted liquid metering apparatus including a helical fastener band self-adapting to a thread pitch. In alternative embodiments, collars rotatively supported relative to a pour tube and a plug portion control the size of a vent aperture and/or a fill window within the interior of the bottle along the pour tube and thereby the volume dispensed; a bottle vent integrally extends from the body of a threaded cap or a plug in radial relation thereto; and electronically timed annunciator means sequentially, uniformly meter a dispensed volume.