Why not a cannery?
A mine tunnel or subway tunnel that is closed off and sealed pre-war..... At one end you input glass, steel, silicone, and a processed food. At the other end you receive mason jars with lids, rings, and seals filled with a shelf stable seal jar.
Doesn't matter if the food is creamed corn, green beans, or beef chili. The system will keep it safely above 160 F to prevent bacteria ( or even irradiate it). Does cost many, many man hours of labor devoted to maintenance and stringent cleaning procedures.
The jar, lid, and seal making operations could be separate..... Salvaged glass; such as auto glass, windows, and other clear glass can be collected easily. Steel salvage doesn't need explaining for that process, only that it will be melted and rolled into sheets. Sheets are then sent through a die cutter that stamps out rings and lids. Silicone can be salvage or from stored blocks.
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