Buy an extra food item at the grocery store. Place it in a cool dark area (Basement/Closet//Under Bed) start up a storage supply. If your short on money even the little things build up example can of beans the price on it is higher than it has been in the past but it will only go higher in the future.

For more ideas let us know what type of environment do you currently live in. House, Apartment, Suburb, City, Stix etc. Not asking you for a detailed location just the general outline so more info can be offered to you and others that are in a similar situation.