What is the purpose of the server decanter and cups? - To look good!

How do I "heat" Sake? - Kettle

What's best, Hot or Cold? - Evaporated

What's a good brand to buy? (Hey, I'm cheap, so use that guideline!) - Try home-made

I've seen Water-Jugs offered, Are you supposed to drink water after your shots? - No, cyanide

Apparently you are also supposed to shave your head before drinking it.