Ok, we are 2 adults and 2 children. Last year we went for 10 days and we did it cheap!
Resort (offsite) $790 We didn't pay this much but this is what it would cost if we had not exchanged our timeshare. (we only paid $100 to exchange and about $245 for the extra nights)
Passes: ouch $645
Driving from Georgia: about $200 round trip we have an Explorer
Breakfast: in room same cost as at home (we had a full kitchen)
Lunch: Packed lunch (wraps) everyday variety of ingredients except arrival and leaving day where we had fast food.
Dinner: Sit down outside of Disney, we eat late anyway so we would watch the fireworks/parades and then go have dinner elsewhere for about $45
Snacks: Packed so same cost as home.
Total eating: $450 dinner out (we even ordered pizza in our resort one night)
BK, Lunch, Snacks: I'm not sure as we brought alot in the car and only purchased things we would have bought at home.
Parking: $40 (4 park days)
extra water park: $85
Souviners: Each child: 1 med. stuffed animal $20.00
One other souv. $30 or less/child
Total: $100 (Dh and I don't need souv. the trip is enough also this money was from our Disney change jar so it didn't seem out of pocket)
Digital Camera : for digital slideshow pics
Advantax camera for prints: $$ probably $60 in film developing but we did one roll/week to extend our joy after coming home!
Ice Cream Social: Yummy great for the price! I think it was around $45+tip but it was also a character exp so fun, fun, fun & priceless
Total: around $1970 for us with timeshare
without timeshare: around $2760
We also had rebates, gift cards (to target used for snacks, suntan lotion), small rewards checks, and survey checks so for us it wasn't even as big as it looks!
Good Luck planning yours! Also, I second letting the kids share a meal with parts of DH & your meals supplimenting each of theirs, it gives them variety plus for ours it helps out nutritionally as they always want to order Chicken strips and fries but they also eat some of my salad (insert evil mad scientist laugh here

)
Kelly