Check out this San Francisco area based blog on someone who is trying to go 100 days on eating for only $1 per day using coupons, growing his own garden and foraging.
The project started out as a bet between a brother and a sister that he could not eat for $1 per day for a month.
Not only has he lasted but now the project is scheduled to go for 100 days!
My favorite posts are the ones involving beating off bees and squirrels while foraging for berries and lemons.
Eating Well for $1 per Day