A dispensing cap system for dispensing a supplement through a bottle neck opening and into a bottle comprises a cap configured for connection to beverage bottle necks of different sizes. A seal is arranged to provide a liquid seal against the neck opening. A valve passes through a storage member attached to the cap, and is configured for movement between a storage position and a dispensing position in which passage is permitted of the supplement material from the storage member into the bottle. A nipple member may be positioned over the valve to allow the bottle contents to be used or consumed.

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