I would add to item 18 and say that you should also stock up on some hot chocolate (if it gets cold where you live) because it is a great comfort beverage, especially for kids.
I would also add mashed potato flakes to this list. It doesn't have to be made into mashed potatoes, it can also be used to thicken a soup and make it a bit more substantial.
Another item to add, actually I would include it with the Spaghetti Sauce, is cans jars of salsa. (Salsa is way more than a condiment to destroy nachos with.) It is an easy way to add a variety of veggies and some spice to meals. You could try adding salsa to rice and canned chicken with some of the beans for a flavorful dish to break up the monotony. You could even use it to make spaghetti sauce.