Buy us each our own gallon and put our name on it. It had to last 4 days. It never did. My mom doesnt really drink milk but she had a gallon as well so she would "sell" us cups of her milk for 50 cents that would go into the milk jar to help pay for the groceries. There were 4 boys in my family.
Now, my family which consists of my wife and I and six kids go through about 6-7 gallons a week. That will go up as the kids get older too. I need a cow.