Abstract: A storage container for making mixtures is provided. The storage container includes a receptacle with a threaded neck and a threaded locking cap screwed on the neck for closing the receptacle, and a substance carrying element arranged in the neck for storing separately gas and/or liquid and/or solid substance(s) to be introduced into a medium stored in the receptacle. The substance carrying element is connected sealingly but releasably to the locking cap and adapted to be brought by turning the locking cap in a condition disengaged from the neck and the locking cap for translating downward into the receptacle. The locking cap is configured to move the substance carrying element between a locking and a dropping position. An outer face of the substance carrying element is provided with an oval flange sitting in locking position on inside lips in the neck of the receptacle and fits in dropping position in an opening between the inside lips.