what about cooking for 4 and freezing 3 of them - casseroles, hotpots, stews, braising steak, shepherds pie, curries, chillies, lasagnes, et., etc. saves a bit of time and effort, and makes sure you eat properly too. i found it very difficult to scale down from cooking for 4 when my 2 sons went off to uni, and even now i always have plenty left over to freeze. stir fry's are good to do for one person too, they're quick and have plenty of veg in them.
as well as delias one is fun, there are a lot of easy, quick paperback cookery books aimed at students which contain loads of cheap, easy and nourishing meals.