Not sure on metal, but We brought plastic water bottles with us last week with no problem... the souvenir cups are $7.. with $4 refills at any booth.. and the fresh lemonade is pretty refreshing in the sun...
Probably not a good idea.
To be safe.. bring a plastic bottle..
no outside anything your bags get searched and you walk through metal detector upon entry.
I saw folks with their water; personal water bottles and holders (like purse straps/cross bodies) for their containers last night.
I've never tried to but their policy is that you aren't suppose to bring any outside food and drinks but the security check is most importantly to check for weapons so they might let you in with it and they might not.
No outside drinks or metal
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