A cartridge assembly includes a collapsible cartridge having a film cartridge wall and an outlet, the film wall bounding a chamber, the chamber extending along a longitudinal axis of the cartridge. The collapsible cartridge further includes a first end having a head part with the outlet for dispensing material being formed at the head part, a support sleeve including a rigid sleeve wall forming a receiving area to receive the collapsible cartridge. The support sleeve includes first and second ends and a support sleeve axis extending therebetween, two half shells connectable with one another to form the support sleeve and the receiving area therebetween, or, the support sleeve includes a connector to releasably fix the collapsible cartridge inside a respective receiving area of the support sleeve.

An attachment for a beverage container may include a cap configured to attach to an opening in the beverage container. The cap includes an opening. The attachment also include a tube passing through the cap. A beverage in the beverage container can flow through the tube and out of the opening in the cap. The attachment also includes a container attached to the tube and configured to hold a liquid. The container includes an opening to allow the liquid to flow from the container into the tube and out of the opening in the cap. The attachment also comprises a restrictor between the opening of the container and the tube, such that the liquid begins to exit the opening in the cap before the beverage begins to exit the opening in the cap.