To build your food supply without a pantry:
1. Cook from scratch.
2. Draft your grocery list of staples you need in your household and eliminate varieties of one staple.
3. See if you could declutter a shelf or more in your linen closet or kitchen cabinet to hold some of your grocery staples.
4. For heavy weight or bulk staples, steel heavy duty shelving units in your spare guest room or basement could be useful.