Q. Would food expenses have to be double counted as well?
A. No. Count only your actual food. Housing is "double counted" because your parents still have the expenses, of providing shelter, even though you are not physically there (you are still considered as an occupant). The cost of your "room", at school, is an additional expense.
I added a couple of other points to my original reply (about savings not being support and how 529 plans are treated for support).
Basically, you have no need to go through this exercise, if you know, for sure, that "there is no question that I do not actually provide half of my own support for the year 2024".
