Apparatus and methods for the controlled preparation of a beverage from one or more beverage bags within a variety of containers and the quick and sanitary storage of the bag or bags once the beverage preparation has been completed. The apparatus may include a drinking aperture, an even retention structure profile, and a bag retention aperture that is openable such that at least a portion of the bag may be drawn within and thereby retained in a position elevated above the beverage so that the beverage can be consumed even with the apparatus in place on the container and the bag or bags retained within the apparatus. The apparatus also may include a depressed wall section sized and shaped such that, when a bag is secured by the bag retention aperture, the bag is prevented from blocking a drinking aperture even when the container is rotated for drinking.