A lot of people are looking for ways to save money on groceries. The US Federal Prison system uses the Armed Forces Recipe Service as the basis for many of their menus. Using this process, the system wide average cost to feed an inmate is just $2.65 per day.
Is this a bread and water menu? No way! You can use this link to view a sample menu. It provides a vegetarian option at each meal, and provides quite a variety.
For you to duplicate this you'll need to purchase in big quantities, grow some of your own vegetables, and hire some people who will work for about $.25/hr.
The menu does a good job of dressing up inexpensive food choices, gives good variety, and can be the basis of a money saving food plan for any family.