Only inside shops
Yes, but it depends on how far you go. There was a vending machine around point 12 I think. We only walked as far as the Glory hole, a little bit past it. So I don't know about anything past that point.
There's also the "Chuck Wagon" that's about half way down thew trail that has water bottles and a small selection of food (off the grill). They only take cash.
No. Not along the trails. The gift shop and restaurant.
They don't have any along the way, but at the very start they have an inside shop that you can get some water!
Yes, they have bottled water at gift shop.
No
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