Grocery Outlet and Trader Joe’s. For GrocOut just go and see what’s cheap, don’t shop off a list. Make sure the prices of the stuff you’re buying is about 50% off or more. At TJ’s everything is priced pretty fairly, just buy what you want to eat.
Don’t drink alcohol or soda, or anything canned really.
Learn to pick locks. Steal food from dumpsters. Get a job with a locksmith. Aquire shelter. Make friends.