"Not including tuition, I lived (and lived comfortably) on $103 a week, which covered my necessities: food, gas, car insurance, a cellphone and visits to the laundromat."
To each his own, but if it was me and I wanted to live on $103 a week I would skip the van (-$1500), gas, car insurance, and probably cell phone too. I know you can find rooms in Durham for under $300 a month. Find a friend to share the room with and you're each paying $150 a month. You then have windows (fresh air), a kitchen, shower and toilet. Maybe buy a bicycle from the Salvation Army for $10 and you're more than set.