Canning foods is 1800s tech. I think taking a look at the sorts of preserved rations available during the Civil War/War of Northern Aggression (I don't don't want to offend any members from south of the Mason-Dixon Line!) would provide a pretty good idea of what could be done post-TDM without much in the way of high-tech gear.
When I was a kid my mum would bottle various kinds of fruit when they were in season - all she used was heat treatment, sugar, water and glass jars with rubber seals in their metal lids. I'd imagine salting/brining meats before bottling them would work pretty effectively too.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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