Answer:
I open to close but I close to open. I'm surrounded by water but I'm never soaking. What am I?
I am a bow that can never be tied or broken but can disappear. What am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
I am an instrument capable of making numerous sounds but cannot be touched or seen. What am I?
I am alive without breath and cold as death. I am never thirsty but always drinking.
The warmer I am the fresher I am.