Learn to cook dude, you can eat really good stuff on very little cash, got me through 8 years of student-dome ! Pre-prepared food is much more expensive than raw ingredients !

Beans on toast (life saver and good for you)

lamb casserole (use a cheep cut like neck)

Any and all soup (boil bones form a previous meal to make stock and drop in lots of vegetables, dried beans and pulses. Very good eating and very cheep.

Buy vegetables in bulk (get a friend to go in with you, they are much cheeper by the sack !

Fish are good also, fries place / sole are quite cheap and also good for you.

Also liver and onions / anything with kidneys,
cheep and yummy and BSE free ! Im still avoiding anything with nervous tissue in it 'cos of the old BSE thing and that includes burgers unless I make em my self.

After a while you will probably get quite good at it (especially if you don't have a choice) and at that point it can become fun. I really enjoy cooking for Catherine / family / guests and I think the fact that I am a reasonable cook was one of the reasons Catherine married me in the first place !