Of course.
Absolutely
Yes. They check bags. Can't bring open water in.
The only issue is canteens really. If you bring your own water bottle it has to be empty. Sealed water bottles are ok. Backpacks are ok
You may also bring a soft cooler with some snacks and water.
Yes, most people take sweaters or blankets. It can get pretty chilly at night
Yup!
Yes
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