Well, what do you want to eat? I guess if you don’t want to prepare your own food, those are the only options, whether at work or at home. Otherwise, make whatever you want and take it to work. Cook more food than you need for your dinner and take the leftovers. Make a salad (tons of options for them), make a sandwich. You don’t have to eat canned soup, make some nice homemade soup and freeze a bunch of individual servings to grab and take. The possibilities are endless.