I would recommend moving to the US. Go to one of our great universities. You'll love it. If you like pretty girls, you'd especially like attending UC Santa Barbara.
To answer your question, first consider that I
a) get some of my food purchased by someone else,
b) purchase some food I don't eat myself and
c) eat some food that is free (well, if you don't count the water bill that I don't pay.)
A rough ballpark guess is about 1.5 cents per calorie or $30 per day.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.