Originally Posted by
skyzo
I usually only spend about $15-20 a week in food when at home (being a bachelor, i spend about that much in beer too

)
I don't see how you can not count the beer so you are at $40 a week even if you don't eat anything that you didn't buy on Sunday.
Then if you don't eat anything else that you either bought somewhere along the way or that was provided by someone else at work, when visiting friends/family, or where ever you are the rare exception.