The invention relates to a cap for making a soft drink in a threaded bottle. The cap comprises an inner cap (1), an outer cap (2) and a flavor container (4). The inner cap (1) has external threads (5) and internal threads (6) that match the threads of the mouth of the bottle, and the outer cap (2) has internal threads (7) that match the external threads (5) of the inner cap (1). The cap comprises a first releaser (8) for opening the flavor container (4) into the bottle when the cap is being screwed onto the mouth of the bottle. The cap further comprises a carbon dioxide container (3) and a second releaser (9) for opening the carbon dioxide container (3) into the bottle when the outer cap (2) and the inner cap (1) are being screwed relative to each other. The invention also relates to a method for making a soft drink.
