Smoked, dried, and/or salted meats might be good for stored foods. Canning isn't an especially difficult technology to master and doesn't actually require cans. Any cantonment that can produce its own glass containers can go into canning. Of course, glass doesn't necessarily travel very well. It's all just another reason why late Twilight formations aren't especially mobile and why sending a single brigade into a neighboring region for pacification purposes (thinking of CONUS) is such a massive undertaking.
Webstral
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