If the the system is going to go down like I think it is...
I would guess seeds for food growing would be a very high priority.
You can buy many packets of seeds and store them in large sealed Glass containers with those little Crystal-like things on the bottom to keep them dry.
Refrigerate them and they will last many years.
I personally bought $200.00 worth today and stored them.
Hope this helps someone,
Ampgod