Where can I find information about food preservatives?

Where can I find information about food preservatives? I am baking something using Betty Crocker mashed potatoes from a box and also using peanut er. I want to be able to preserver them for 30 to 60 days without refrigeration. So, what additives or preservatives can I use? After you answer this here, please send your response to my email address also so I can interface with you if your answer is of any value. jhowarddowdell@hotmail.com