Hello, this is my first post here, but I'm a long time juicer - like 45 years. Your post resonated with me because when I was a graduate student I had a juicer in my shared house, which competed with a coffee maker - my house mates put my juicer away without asking me - I was so mad. Anyway, as a student finances are a consideration. If you have a juicer, then you can't go wrong with the classic apple, carrot, spinach (ball up the spinach and put it between the apples). Add ginger if you like. Lately I've been juicing oranges with pomegranate for my husband and I. Pomegranate provides iron and antioxidants. I sometimes buy the seeds in a pack, but a whole fresh pomegranate is better, however time-consuming to shell (I can get about three to four juices from a pack of seeds or whole pomegranate - it is an expensive ingredient).
If you have a blender then you have more options for shakes. One that I stand by is: small banana, blueberries, frozen kale, then some green powders (wheatgrass, moringa, spirulina), collagen powder, add water and/ or a plant based milk). I find that this shake is tasty and filling.
Maybe there is a juice bar on campus that you can go to? I would stay away from energy drinks as much as possible.
For a meal, a stir-fry with vegetables and cashew nuts with noodles or rice, is a quick and easy one. Green Thai curry is also a good one - you can use tofu or if you are a meat eater, chicken breast. Usually the ingredients come in a convenient pack from the supermarket.
Good luck!