My dorm cook is still going from potluck to potluck, so no dorm cooking yet for her! Just in case you need a recipe, try this. Proportions aren't exact.
For your 4 ingredients: rice, frozen chopped spinach,feta cheese,and olive oil.
Make your rice: proportions are 1 cup rice to 1 1/2 cups water for white; 1 cup rice to 2 cups water for brown. I would use a rice cooker, but if you haven't spent your $15.00, try to dig up a stove somewhere.
Start the rice. While it's cooking, take a handful or so of the frozen spinach and put it in a bowl. When the rice is done, stir in the spinach. The heat of the rice should warm up the spinach. Throw in some feta. Sprinkle with olive oil.
Try to save some for tomorrow.
Frugal Tip: the best place to get feta is at Sam's Club or Costco. Feta also freezes pretty well.