We have an Amish store about an hour from us. You can buy in quantities to fill food safe 5 gallon buckets. Line the buckets with Mylar bags, pour in your contents, toss in a handful of oxygen absorbers, seal the bag and bucket, and you’re good to go. Fill the buckets with rice, corn, different kinds of beans, lentils, wheat berries, flour, sugar, salt, oats, etc…. Also get various seasonings to enhance flavor. You can get everything you need for storage on eBay or Amazon. Very inexpensive. This way, provisions can last 20 years or more.
Bread is great sustenance. Do you have a grain mill to grind corn and wheat into flour? How much yeast do you have? Buy honey which has a long shelf life and can be added to bread.
Filled buckets stack four high. 16 buckets take up little room and contain a lot of food.
Water is also key. I have life straws. But I have an Alexapure filter for the house. I live 200 yards from a freshwater lake which will be my water source - unless it’s ruined by fallout. Then I’ll have whatever I have on hand. (Water heater has 50 gallons can fill tubs, etc..)
Just thinking out loud.