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first off, quit going to places like Tesco or Sainsbury's. Aldi and Lidl are your new best friends. Stay away from all brand goods, but all of that is pretty self explanatory. Spend money on pasta, veggies, preferably canned veggies and frozen veggies. Spinach etc. Rice, eggs and ramen (as you mentioned yourself are fine) but also get potatoes. A bag of potatoes shouldn't be too expensive and you'd be surprised by what you can do with potatoes. Make sure you have a variety, get canned meats or fish, the cheaper the better, quality shouldn't matter at this point, quantity and variety should. Flour, eggs and milk make pancakes, chop up some spring onions and put them in the batter, it makes it slightly more nutritious.