Answer:
I have a mouth on my head and eat everything.
I climb higher as I get hotter. I can never escape from my crystal cage.
My first half means container. Not a lot of people understand my language.
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.