Clip coupons. It may seem silly, but clipping coupons can help you save more money than you imagine. You can find coupons on countless websites online that offer printable coupons.
Or, if your college offers free newspapers, pick one up each day and peruse the pages for money-saving coupons. Food companies know that people are looking for ways to stretch their food dollars and are putting more and more "buy one, get one free" coupons out there to help.
Buy in Bulk. Warehouse-type discount stores like Costco offer bulk quantities of food that may cost more initially, but will save you money in the long run. You can buy many staples like peanut butter, potato chips, soup and ramen noodles at bulk prices. Meats and other perishable items are available in bulk as well--just make sure you have a place to store it. Otherwise you'll watch your investment spoil faster than you can eat it.
Split food costs with a roommate. Another good way to afford food you might not be able to otherwise is to combine food costs with a roommate. That way you can combine budgets at the grocery store and get more food. Just make sure this is someone you can trust to share the food equally.
Buy store brands. Many grocery stores sell their own name brand items for everything from bread to milk to canned vegetables. Buying your favorite foods in the store brands is normally much cheaper than buying the name brand, and the food will taste the same.