Given a bare but not sterile environment and the sorts of supplies one would have access to in a well-stocked cafeteria or a bad grocery store, is it possible to start growing food? Assume frozen, canned and otherwise processed food is available but fresh fruits and vegetables are not. Phrased another way: What are the minimum requirements to be able to cultivate food?
I realise this question is relatively broad, but I hope it's okay to ask here - I'm asking this for a story I'm trying to write. I have very little knowledge about farming, except for a vague impression that you can grow things in coffee grounds and that you can make prison wine using bread and fruit juice.