I found this on the My Fun Club website this morning

No food Policy

Sea World and Warner Bros. Movie World have introduced a new food and beverage policy effective from 1 July 2009.

Food & beverage, eskies and coolers may not be brought into the parks. Guests with special dietary requirements as detailed below are exempt from this policy:
- Guests with allergies
- Infants and babies
- Pre booked education groups

You may bring in fruit and bottled water. Although a new policy for our parks, this is an industry standard practice employed by most theme parks as well as sporting and entertainment stadiums worldwide.
Allergies are exempt which is good to know.