You use just one foil. The coffee is packed into the capsule which seems to hold it in place. Very little falls out. You do not want to leave it that way long as it is open to the air. If you want to make them up in advance and not have ANY coffee coming out then you can use two foils or put them in some tupperware.
Rivo: How are the foils installed on the Rivo since the cap is punctured from both ends. Are 2 foils installed on one cap?
Posted by David Dorfmueller on