I have PET bottles I have used for 5 years. Several of which have gone through multiple freezing cycles. When the cap is tight the pressure keeps the form pretty well (air or water). That might keep them from getting crushed.
Peanuts are grown in about a third of the country
That might expand after the war due to peanuts fixing nitrogen (a good replacement for fertilizer).
You could have a dozen different food types and you eat the ones that don't match the area.
I want the kit to allow for various options. The improvised knife is if you are playing someone who lost things that were more dangerous.
As to the cannabis that is exactly the point. I doesn't look like something a military person would have and it has trade value.