Abstract: A supplement dispensing closure couplable to an outlet of a container, such as a water container. When the closure is coupled to the container, liquid exiting the container through the outlet flows through a supplement retention area that retains a dissolvable supplement body inside the closure as the liquid flows therethrough and dissolves the dissolvable supplement body. A user may select one or more dissolvable supplement bodies and insert them inside the supplement retention area for dissolution in the liquid as it flows through the supplement retention area. The closure may include a selectively openable and closable cap portion. The closure includes a selectively removable filter assembly configured to filter one or more components from the liquid before or after it flows through the supplement retention area.

Abstract: Provided is a container cap assembly for a water container with the container cap assembly having a compartment for holding a tablet of a substance to be added to the water. As water exits the water container, the tablet is gradually dissolved, and the user receives water that was in the container as well as the additive that was in the tablet. This can include vitamins, minerals, other supplements, coloring, flavoring, antibiotics, or other water additives.