A fitting for affixing to a mouth of a receiving container comprises a tubular body having a top end, a bottom end and a side wall extending between the top and bottom ends and having an inner surface and an outer surface. A partition is integrally formed on the inner surface between the top end and the bottom end. The partition divides the body into an open top region and an open bottom region. The inner surface of the open top region has a top threading and the inner surface of the open bottom region has a bottom threading. The partition further includes an aperture therein adapted to permit passage of a standard size, disposable straw therethrough from the open top region to the open bottom region.
