Three-Month Supply

Build a small supply of food that is part of your normal,
daily diet. One way to do this is to purchase a few extra items each week to
build a one-week supply of food. Then you can gradually increase your supply
until it is sufficient for three months. These items should be rotated regularly
to avoid spoilage.

Can someone explain to me how I am supposed to procure a three-month supply of In N Out???