Probably also ignoring his college dorm, tuition fees, and probably cafeteria fees.

There is no way you can "buy in bluk" when you have 1 dollar a day, as described in the article. You can barely get one orange per-day. Not to mention, there will be no way to reach a whole-sale store in the U.S., since you cannot afford any transportation, public or private, with 1 dollar.