A capsule includes a first container provided with a first closed cavity containing a first product and a second container provided with a second closed cavity containing a second product. The first container and the second container include a first interface element facing the first cavity and a second interface element facing the second cavity, respectively. The first interface element is provided with a first connecting device having a first conduit and the second interface element is provided with a second connecting device having a second conduit. In an assembled configuration of the capsule, in which the first container is associated with the second container, the first connecting device is engaged with the second connecting device so as to couple the first conduit with the second conduit to make a flow connection between the first cavity and the second cavity and enable at least the first product to pass into the second cavity and join the second product to make a final product.