Abstract: The invention relates to a bottle closure system and to a cap that can be incorporated in said closure. According to the invention, the bottles (2) are closed automatically with the insertion of a cork. The inventive method comprises a step (11) in which an accessory cap is placed on the end of the neck of the bottle (11). The accessory cap stays in place in an independent manner while the corresponding cork is inserted into the bottle through same and remains in place for the later removal of the cork.