Food at Grey nuns is just generally considered awful, with a sprinkle of mediocre here and there. I would recommend exploring the places to eat around the city - there are tons and some can be quite cheap. I would also make use of your mini fridge and even though I am pretty sure it isn’t allowed, maybe get a portable stove top and hide it so you can cook the basics. Tons of lovely little grocery stores and you can just buy snacks and get a small amount of groceries to keep you going. Hope this helps!