Watch your son closely. I did that Herbalife diet and wow, all the darn pills really made me sick to my stomach. What a waste of $200.
I live in a basement, and do all my cooking there but I am allowed to cook, so I kind of understand the situation.
You have to be careful where you eat, and what you order. Since you are so limited on what you can eat at home, it will get tiring soon. I'd probably be doing fruit and maybe whole sprouted grain or mana bread, and buying salads and baked taters. Those taters probably can stay a day outside the fridge too if you don't have one. One thing that is good, just open and eat, veggie baked beans.