If you are a bachelor, consider this: Buy a 4 liter milk jug instead of a 2 liter milk jug. Get your money's worth. When you open it, put a pinch of salt in it then shake. Your milk will last 2 weeks past the expired date. Take care.
If kept at a temperature of 40 degrees F (4.4 C), milk will typically last for a week beyond the expiration without the addition of salt. Also note that the higher the fat content, the longer it will keep.