I can and have actually but I learned the hard way: I can eat cereals and pasta for days if I don't have anything else to eat and am too lazy to go outside. :/

Exactly. All you need to know is how to boil water, use a microwave or an oven and make some salad dressing (if you don't wanna buy all made one). And there are tons of little things you can add to make dishes a little tastier that don't require any cooking: mozzarella or Greek cheese, walnuts, pine nuts (you can also roast these), garlic and parsley butter (this you can make yourself and freeze it and it'll last you ages or you can buy), maize kernels, prickly pears or grapes, apple slices of even slices of orange too.

Oh I forgot to mention something: honey. This is great to cook apples and bananas with but also with meat (in tajines for example) and it helps a lot with sore throats ;)