One way people are using to save money is to participate in a Pantry Challenge. They try to go a month by using items in their pantry and freezer. They do buy some groceries, but try to limit trips to the store by using things they have on hand.
This will cut down on your bills and also help you use up items before they expire. If you use a menu planning system, you can take inventory of items in your cupboards and freezer and use it to make up your menu plan.
By limiting your trips to the store, you may also limit the temptation of impulse purchases.