They seem pretty relaxed. Still, I don't know, but if they made you leave them outside, it wouldn't be hard for you to go eat and walk back.
I've never had a problem, I usually bring my own water and they don't care so I assume it's the same for food.
You may bring snacks as long as you dispose of the trash properly.
I have never tried, I could see drinks, but food seems like it would be kinda hard with no place to sit it down while you played
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