Patent ID: 8662351

Claim:
A supplemental beverage container comprising: a body defining an interior compartment for containing a supplemental liquid, said body having a top, a bottom and a sidewall extending from the top to the bottom; a top opening at the top of the body, a bottom opening at the bottom of the body, and a conduit extending from the bottom opening at the bottom of the body to the top opening at the top of the body, said conduit defining a fluid flow path from the bottom opening at the bottom of the body to the top opening at the top of the body; a container attachment at the bottom of the body, said container attachment configured to removably attach the supplemental beverage container to a primary beverage container; said opening at the bottom of the body being in fluid communication with the primary beverage container when the primary beverage container is opened and attached to the supplemental beverage container; an aperture in the conduit, said aperture providing fluid communication between the interior compartment of the supplemental beverage container and the conduit; a vent port in the body, said vent port providing venting for the interior compartment, said vent port comprising a vent opening in the top of the body, and top of the body including a threaded collar and a removable threaded cap, said cap threadedly engaging the threaded collar when attached to the collar, and said cap securing the first portion of the removable seal in the conduit and on the aperture and the second portion of the removable on the vent port, when the cap is attached to the collar; and a removable seal having a first portion configured to extend into the conduit and cover the aperture, said removable seal further comprising a second portion configured to extend to and cover the vent port, said removable seal comprising an elastomeric gasket.