Here is an estimate of what we spent a month ago.. not exact, but pretty close.
Four of us: DH, me, DD (7) and DS (15). We had everything paid for (airfare, hotel, passes, rental car) except our meals, souveniers, parking and cost of sitter for our toddler and boarding our dog. We took $1500 and a credit card.
We spent $1300 in 7 days... eating onsite (counter service) and offsite, inclucing two meals that were $100 (Chef Mickeys and RFC)... no alchoholic beverages and we didnt buy drinks in the park (did buy desserts at times), but went to publix and stocked up. We also bought disney quest tickets for four of us. It was about $100 a day for food... a little less on some days and more on others. We didnt eat frugally, but we definately didnt splurge either. We spent $200 on souveniers. 75 to board the dog.. $56 for airport parking... 150 to our sitter. $50 for a trip to publix for drinks. $25 for a trip to
walmart for film and misc. That is about it.
We wrote our expenses in a little book daily, just to have a record for future trips and to track our spending. We found that knowing where we stood really helped us to make decisions that would keep us within budget (didnt want to have debt on the credit card unless it was necessary). The kids really wanted to do a water park, but we had already splurged on DQ tickets... just having it written in the book helped us to resist the temptation to spend that extra $100 and we had a great time at the hotel pool that day instead. It was a good tool to show the kids and help them to understand the budget.... it helped us all to weigh what we wanted to do.. where we wanted to eat and see how it would affect the budget for the rest of the trip. We came home with money in our pocket

We decided to not do two PSs we had planned because eating expensively wasnt as important to us as having time in the parks
Good luck!
Sheila