If your trip is already paid for, you don't have much to worry about. Just tell the kids that they can buy something towards the end of the trip & give them the money later. When we go to Disney and we are on the DP, we don't spend that much money at all. Just take some items from home to eat in the mornings, have a CS for lunch, a snack later & dinner out. Everything but your breakfast is covered. If they need an extra snack, let them get one and pay for the others later in the trip. You will only need to have money for the tip at dinner for yout TS meal. Believe me, it's doable so don't stress about it.