The family still gets the treat of dining out, but it literally does become a treat then, not a normal thing. The money that you will save from eating at home will very quickly add up. Another expense that is unnecessary is buying your lunch everyday. Make lunches the night before, right after dinner if you are taking left overs, or while preparing dinner if taking something like sandwiches. This keeps all the mess of the preparation to a time when the kitchen is already in chaos.
Grocery stores are another pitfall for excessive spending habits.
Look through local fliers to see what is on sale that you would normally buy, as well as for there are just great bargains. Clip coupons as well. Try and stay away from pre-packaged, prepared foods. These tend to be very costly and generally, the quality of food prepared from scratch, or close to scratch taste a whole lot better. Always shop on a full stomach, or after eating a big meal.