Abstract: A capsule for mixing multiple substances, comprising: a main chamber having a main chamber bottom and a main chamber top, the main chamber top having a top opening; a main piston fitted in the main chamber; a torque adapter for transferring a torque from an external actuator to a mixer element via the main chamber bottom; and a cup shaped reservoir having a reservoir bottom which is having a bottom opening, wherein the reservoir bottom is fixated to the main chamber top such that the bottom opening is aligned with the top opening of the main chamber, so that fluid pushed by the main piston from the main chamber is passed through the top opening and the bottom opening and is accumulated in the cup shaped reservoir.