Abstract: A cooling cube assembly for cooling a liquid contained within a beverage container. The cooling cube assembly includes a cooling element containing a cooling solution, and an insertion and extraction filament attached to the cooling element for inserting and extracting the cooling element from the liquid within the beverage. The insertion and extraction filament is an elongated flexible filament connected at a first end to the cooling element and at a second end to a tag for inserting and extracting the cooling element from the liquid within the beverage. The cooling element is inserted into the liquid to be cooled while the tag remains outside of the liquid. The cooling element is extracted from the liquid by pulling on the elongated filament with the tag after the liquid is cooled to a desired temperature.