Staying at your parents' house might be free ($0/mo). Food? I think $700's a high quote, even for SF, but you can save quite a bit eating at home in Bumblefuck, Alabama relative to San Fran. Most people don't live in Boston and NYC, either.
I'm not talking about stretching living expenses from 6 months to 8 months - I'm talking about stretching them to 24 months.
I'm not talking about stretching living expenses from 6 months to 8 months - I'm talking about stretching them to 24 months.