In "By the Waters of Babylon" what container type makes the food and drink the boy finds edible and drinkable?

"They got their food from enchanted boxes and jars.'  These enchanted boxes were refrigerators, and cabinets, the drink was in bottles and made his head swim.  This was probably a liquor of some type, maybe beer.  The reason these foods are still edible and drinkable is because they are stored in steel cans and glass jars. It would be as if there were a catastrophic event today and someone came years later.  They would still find food in our cabinets and refrigerators that would still be edible.  Not all food would spoil if it was canned properly or jarred properly.