We all know that Catholics, Orthodox, and some Anglicans approach the Sacred Species as not only to be consumed, but to be treated with the greatest reverence outside of the Eucharistic celebration. Orthodox and some (perhaps all) Anglicans reserve the sacrament for later reception. Some very conservative Anglo-Catholics even have Eucharistic Benediction.
But what do other Christians do? Do any of them have reserved sacrament? And what do they do with the “leftovers” after they are done receiving? Put them away (in Tupperware, plastic bags, or similar) for the next time the Eucharist/Lord’s Supper is celebrated? And what about the crumbs and the leftover wine? Throw them away? Rinse out the chalice or cups and pour the liquid down the drain?
I am aware that the Lutherans believe in “consubstantiation” or some variant thereof — Luther said that the Real Presence is as the heat of a piece of iron thrust into a fire, remove the iron from the fire and the heat is gone. Methodists also believe in a sort of “real presence” but they do not define it. And others such as Baptists and evangelicals merely think of it as a memorial or a sacred meal.