<<Disclaimer: Verify this information before applying it to your situation.>>

Thank you to all who answered. The consensus was that Six Flags does not offer gluten free options (except Kozy Shack pudding) and that they will allow you to bring your own food in if you have food allergies. Thanks for your help. 
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Visit the Celiac Web Page at Http://www.enabling.org/ia/celiac/index.html
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