I wonder how long you could last in the room you're in right now without bringing in additional supplies of food.
Hint : The glue that is used in the binding of books and wallpaper paste can be good for sustenance.
I'm currently in a bar. they have loads of crisps and choccy bars and of course beer. think I could last ages in here but will have to ask them to turn the music down when it's time to sleep