Cooperage is a specialised skill and lots of wooden barrels might be a big ask now I think of it. However, big metal barrels might be achievable.
Rolling fairly large and thin bits of recycled iron or tin would be fairly simple. Electro tinplate this and weld it shut. Then weld the botton shust with a tinplated disk and then fill the can. Weld the top shut and you should have a reasonable product. It's large scale and manpower intensive but should be achievable, the metal is easily available, then you need a way of making a salt solution of the tin and a generator.
Again, this should be achievable with enough people and resources. In smaller societies, reusing cans migt be a possibility.
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