This is the most obvious answer, but yes, you can save a lot just by living at home. You can save money on rent and utilities.
Paying for school lunch is expensive than homemade food. On campus, the food price is double than the original place. You can save at least $50 or more a week by making food at home.
If you look at your expenses every month, you know not to overspend. College students like to spend more than saving. If you cut down on some things every month, you'll have more in your pocket for other important things.
Universities always held some kind of event for all students. If there is an event that give out free food or things, you should go to it. Take the advantage to get free things! Who doesn't love free things?
Coupons always have something free. However, don't use it if you don't need it. Coupons are there to help you save when need it.