So, over the past while thoughts like going on a loooong backpacking trip come to mind as I am sure others have thought of it at times. And I wonder, mayhaps we should combine our powers to figure out what each areas cost of food and board (motels of hostels if you live in an area that HAS hostels) is on a tight budget. Of course that means instead of going to a restaurant I or someone else would go to the local market and get some cheap eats for the day.
I'll start, not that anyone would want to backpack through America as far as I know.
In Colorado a careful person could get by with maybe 4-5 dollars in food a day, even less depending on how much you eat. Bread is of course cheap everywhere, being 1.50 for a nice size amount, could even last several days in fact with supplemental meat and other things bought to add mass. A super cheap feeling person can snag a pack of beef cold cuts from king soopers for 50 cents, and it'll be enough to fill you at least half a day with some bread.
Almost forgot, motels are like maybe any other metro area of the US, $10-35 a night. Would be better to make friends on the way for free stay.