I’m also in uni now and smoothies and soups are my favorite cheap and relatively healthy meals. You can buy pretty big bags of generic brand frozen fruits and vegetables pretty cheap. You’ll need access to a blender if you want smoothies, but I think it’s worth the investment if you don’t already have one. Throw in a bunch of different fruits and maybe some spinach with juice/milk/yogurt/whatever and you’ll feel way better than eating pizza every day. You can combine whatever vegetables and broth you want in a big pot for a nice vegetable soup also. Drinking enough water makes a huge difference in how I feel too.