ya . grocery store . can probably get by on :
box of cereal $ 4.00
1/2 gallon of juice $ 3
fruit for 5 days of lunch $ 11
salad fixins for 5 dinners $ 7
thats just the weekdays and i'm up to $ 25 . 5 bucks a day . ooops.. forgot milk $ 2.50
cheaper cereal exists than $4 a box. You can probably get the juice for $2 ( maybe frozen), but I get where you're going with this !
$5 day without living on mainly on rice and eggs and Spaghetti is the realistic minimum ( at least $3) and $1 means you're going to live off of fat reserves and a month is about as far as you can go... maybe a few months if you're fat.
I agree you can't go on $365 for a year without some help from a garden, dumpster, hunting and gathering, fishing pole, etc.
I'm sure Tom would not make it a year for a million $. I initially thought I could, but NO ! These guys that try it lose 10+ lbs a month. I'm assuming I can't even supplement my diet by eating insects or something. Maybe in China or similar where food might be cheaper, but not in the USA....unless you can get brown rotten bananas for 5cents a lb or other old food super-cheap.
Good challenge here....I can't see anybody going much past a month w/o help in the form of severly reduced produce ( at least) that is beyond the cheap prices most could get. I don't see getting 2,000 calories a day ( about what you'd need minimally) on $1.....even if you did you'd be missing a lot of essential nutrients.
A coupon champion could probably do it for a year, but that changes the premise.