Fast food is supposed to be an easy way to feed the family without cooking or washing dishes. However, ordering for four people can get surprisingly expensive once you add drinks, sides, and extras. What starts as a quick dinner can turn into a much larger bill than you expected. The good news is that a few simple changes can help you avoid unnecessary spending without leaving anyone hungry. Before placing your next order, watch out for these seven mistakes that could add $20 or more to your family’s fast-food bill.