Device for preparing and dispensing a mixed substance and method for filling a device

A device (1) for preparing and dispensing a mixed substance (23) starting from a first substance (5) and a second substance (6), comprising a first container (2) containing the first substance (5) and a second container (3) containing the second substance (6),

• the first container (2) and the second container (3) having a common central axis (A) and being arranged one behind the other along the axis (A), the first container (2) having a ceiling (10) with a first opening (13), a first wall (11) extending substantially perpendicularly to the ceiling (10) and extending around the axis, and a first bottom (50),
• the second container (3) having a second wall (43) extending around the axis (A) and a second bottom (54), the first bottom (50) having an outlet formation (20) which is configured to be closed by a closure part (4), the closure part (4) also forming a lid for the second container (3) by connection to a free edge of the second wall,
• wherein the outlet formation (20) is configured to be brought into alignment with a second opening (21) in the closure part (4) by rotating the first container (2) relative to the closure part (4), the alignment clearing the way for the first substance (5) into the second container (3), for producing the mixed substance (23) in the second container (3), wherein the ceiling (10) and the second bottom (54) form opposite ends of the device (1), wherein a third opening is formed in the second bottom, and wherein the mixed substance (23) is removable from the device (1) through the third opening,
• wherein the ceiling has a first sealing plug (14) configured for closing the first opening (13) and which is removable from the first opening, wherein the second bottom (54) comprises a second sealing plug (44), and wherein the second sealing plug is connected to the second wall by a closure cap (45).