To keep your lunch cold with out a fridge get an insulated lunch bag and an ice pack. You can take all sorts of salad ie. green, macaroni, potato, pasta salads. Sandwiches are good and you can make them less ho-hum by using different types of breads (pita, tortillas, rolls, kaisers, bagels, english muffins). There are many options for fillings such as peanut butter, lunch meat, egg, cheese. I like crackers and cheese, muffins, dried fruit, fresh fruit, raw vegetables and cereal. You can take a thermos for hot things like soup or spaghetti. Get a good stainless thermos and pre-warm it with hot water before adding the food and it will keep warmer. It can get really boring eating the same things over and over again. Even if you only take your lunch M-W-F and eat out the other 2 days you would still save a lot of money.