And I would have to say the above wouldn't be 2 full meals, maybe a CS lunch/dinner and a snack.
Personally I would suggest you checking out the menus on this site and also allears.net There you will find the prices/or close to them to get an idea as to what you may spend.
But if I was forced to say an amount I would say you would need at least $40 per day per person and that would be very frugal. (and that would be with no TS meal)
Stuff is EXPENSIVE on property, period, they know you are there and if you have to eat there they charge you.