The Basics.

Here is a list of basic ingredients I will assume you have.

Onions
Celery
Carrots
Garlic
Flour
Salt and Pepper
Access to spices
Milk
Oil (Canola and Olive)
Butter (unsalted)
Basic Condiments (Ketchup, Dijon mustard, Mayo)
Bread
These are the basics that are in most recipes that I make.