...that in all the talk about reservation and such around the Lutheran blogosphere, this has not been mentioned:
From *The Altar Guild Manual: Lutheran Service Book Edition*:
If any of the Lord's body and blood remain, they can be disposed of in a number of ways. The best way is to consume the remaining elements, since the Lord said, "Take and eat...Take and drink," and did not provide for anything that was left over. There is historic precedent *for reserving* the remaining elements against the next Communion. The hosts can be stored in a pyx or ciborium (apart from unconsecrated hosts), the blood of the Lord in a suitable cruet or flagon (apart from unconsecrated wine). What remains in the chalice, however, should either be consumed or poured into the piscina or onto the ground, since there may be crumbs or other foreign matter in it. *The reserved elements* may then be kept in the sacristy or placed on the altar or credence and covered with a white veil. It is un-Lutheran and irreverent to place unused elements in the trash or to pour the remainder of what is in the chalice or flagon into the common drain. - p. 89
Consume remaining elements OR put the consecrated hosts into the proper receptacle (not mixing them with unconsecrated hosts); put consecrated wine from flagon or cruet (or remaining individual glasses) into the proper receptacle (not mixing it with unconsecrated wine); pour remaining wine from chalice into the piscina or onto the ground.
Pour water into flagon/cruet, chalice, and the used individual glasses, then rinse out into the piscina or onto the ground. - p. 101
I note that this book contains the following on its cover page: Authorized by the Commission on Worship of the Lutheran Church--Missouri Synod. I believe that this gives the contents the force of rubrics for our use. Thus, there is the best practice (consumption) and that practice also allowed which has historical precedent, namely, reservation "against the next Communion" [which may well be the communication of shutins].