Bushing for receiving a dropper neck, and corresponding package and kit

A kit for the preparation and aspiration of a suspension or solution formed by mixing a first product with a second product, the kit comprising:

• a first bottle containing the first product;
• a second bottle containing the second product, the second bottle having a dropper neck;
• and
• a bushing distinct from the first and second bottles having a receptacle configured to attach to the first bottle and receive the dropper neck, wherein the receptacle has a shape that matches with a shape of the dropper neck,
• the bushing further including a stopper and a cap, the stopper configured to cooperate with the receptacle, the stopper having a shape that matches with the shape of the receptacle, the shape of the stopper being similar to the shape of the dropper neck and having a closed bottom end that seals the receptacle and prevents transfer of material from the dropper neck to the receptacle when the stopper is mated to the receptacle,
• wherein the cap has an inner wall, an outer wall, and a cut-out between the inner wall and the outer wall, an upper part of the stopper configured to be housed in the cut-out.