Water bottle and allowed to be carried in?

I carried 2 water bottles in yesterday and they were full, unopened and in my backpack.

Yes,just to be empty or unopened

They're allowed, at most they might make you dump them out, but once in the park you can get a free refill anywhere soft drinks are served

I was allowed in with (1) unopened dasani and (1) empty refillable sports bottle

Yes, but they must be empty. You can refill for free in the park.

A water bottle without water is allowed