Abstract: Systems and methods of delivering a powdered, granular or liquid material into receptacle container in a clean, easy to use way are disclosed. The systems include a tub or carton configured to contain such materials and to easily release its contents into the receptacle when opened. In some embodiments, these systems are configured to be placed over receptacle such as a beverage or water bottle, baby bottle, child's sippy cup or drinking glass or any other such container with a mouth that can be opened and oriented to point substantially vertically. In some embodiments, the systems are configured to open when pressed down onto the receptacle such that the seal is pressed against the mouth perimeter and forced to tear or pull away or flex away from the opening at the bottom of the tub, thereby releasing the tub contents with the aid of gravity into the receptacle below.