A humble brew

If you are cold, it will warm you; if you are too heated, it will cool you; if you are depressed, it will cheer you; if you are excited, it will calm you. --William Gladstone, British Prime Minister

Better be deprived of food for three days than it for one -- anonymous, Chinese

What am I talking about? Stereotypes would have jumped to conclude it is beer. Not so fast boys, just wait for more...
More clues:
- It is usually associated with Zen Buddhism
- It can be had with milk or without milk, cold or hot, with lemon or with honey or both
- It hosts a storm in the cup if it has to.
- Everybody does not have a cup of it

You would have guessed it already, so enjoy some trivia:
- Across world, it is popularly known in Chinese Amoy dialect word; while in India and some other origin nations, it is its cousin, the Chinese Mandarin word that is popular
- Initially it was sold in Europe at $100 per pound along with such rare spices as ginger and sugar! (What? Sugar? A rare spice?)
- Due to its unpopularity with the high priests of those days, and inheriting a foreign origin, it attracted a 119% tax in Europe during early days. (And you complain about 12% VAT on Cigarettes today!)