Charlie, what kind of training are you doing for 4 hours a day?
On Saturday and Sunday, prepare food for the rest of the week and store it in the freezer. Mince is ideal for protein, because you can cook a huge chilli; I would add baked beans and ground almonds (I just throw whole almonds in a blender till they're fine enough). Baked potatoes and rice are easy to cook in bulk. I used to make half my meals whole food and half blender shakes (with things like oats, nuts, whey, cottage cheese, eggs), so I could cut down prep time. Some days I would go to McDonalds a couple of times and order double cheeseburgers: get four of them and make two quadruple burgers by taking a couple of the buns away from each pair. I don't know if that is possible, because if you're on a proper campus, you may not have access to fast food. Is it possible for you to bring a cooler with you? That would be ideal.
Some of the cheap foods you can buy are: EVOO, oats, rice, potatoes (these cost me about six quid for 20kg for reference), cottage cheese, eggs, beef (mince is about Ã?Â£6 a kilo), turkey, and tuna.
Get a magic bullet blender, a lot of tupperware containers in varying sizes, and some ziplock freezer bags.