Universal and Island of Adventure in fla.?

i have already booked the hotel. & bought the tickets.so im good on that..it will be me my sister and her bf.. my sister is 17 & her bf. is 16. ill be paying for there food.. we will be eatting at the waffle house in the mooring..lunch and dinner will be at a fast food place so we can take it back to the hotel. were going for 7 days. how much will i need for food. for all 7 days? im thinking 800.00 to 1.000. what do you say? thank you.