Hey dude, since your gonna have access to a grill and a rice cooker your pretty set as it is.
Id suggest buying a couple of bags of brown rice, oatmeal, dried fruit, cans of nuts, tuna packing in water, can of kidney beans, cans of salmon etc.
Basically you want things that wont perish but are also good for your BB goals. Canned foods are hands down the best as you can take them anywhere and they last forever i.e. Have a can opener, a fork and a few cans of tuna in your car and you'll never miss a meal.