We've just returned from 10 days & averaged $100 a day for food & drink between the 2 adults & one teen.
We were too shattered some days to eat out in the evening, so a few Uber eats at $30 - $40 for 3 of us.
We generally ate one meal a day. There were croissants / breakfast options in our hotel (Dockside) & doughnuts / ice creams to snack on in the parks - they're all huge, even the pint sized coffee feels like a meal.
We ate at ihop, 3 meals, 3 drinks was $60. Olive garden was $70 total, with unlimited salad. Millers was $100 and we all had steaks, puddings & beer for the adults.
Think Cici's do a $5 pizza buffet.
Walgreens / Walmart great for water & snacks, much cheaper than in the parks. Anything outside the parks is much cheaper, but we thought voodoo doughnut was reasonable & really filling.
If you're not eating in city walk twice a day you'll be fine. We had too many frozen butterbeers, pizza in the marvel cafe (one slice is huge), Cinnabon, lemon slushies.
We took £5k, and spent £2k. Granted DH had the odd beer but we didn't drink most days. And spent $300 on merch & bits from the universal store, plus a day at the mall.
Ubers cheap for getting around.
Longboard pizza at Volcano bay can be shared. Plus free refills are plenty.
We were first timers and it was fantastic, and all of the financial anxiety soon disappeared when we got our heads around the place. It really isn't as extortionate as they say. I hope you enjoy it x