I know it's been awhile since anyone has posted on this topic but I'm very new here so please bear with me.
Correct me if I am wrong but perishables such as fruits, veg etc can potentially be high risk food items. Dry goods such as crackers and rice (uncooked) if kept dry can potentially keep for longer. More so rice than crackers I would think.
I agree with you on the saving money and health & safety is the primary concern. Maybe buying fresh and dehydrating or canning from scratch would be best if you do not prefer to buy smaller portions of canned food from a grocery store.
I am very interested in this topic as well I a have been cooking and baking for a long time and all this canning info is so new to me its scary. I mean botulism?? Eek! Definately worth reading about. Never hurts to have some extra food around with all the predictions we have been having anyways.
I hope you found some answers by now.