Abstract: The inventive concept discloses a portable container comprising a bottle and at least one compartment integral to, and sealed off from, the bottle. The bottle contains a first liquid (in the preferred embodiment, premium drinking water). The compartment is structured with dimensions and profile corresponding to a beverage cartridge of the type which is typically used for single-serve coffee containers, such as the K-Cup®. A means for secure retention of the beverage cartridge within the compartment is provided, dependent on the contours of the beverage cartridge. The processed essences of teas, chocolates, cocoas, dairy-based beverages, and fruit concentrates are also suitable for the disclosed concept. The first liquid and the beverage cartridge are kept separate until a user removes the beverage cartridge and opens the bottle for combining the liquid and the contents of the beverage cartridge in the desired manner of preparation of a beverage.