A long, hot bath is a real treat. But from a 'green' point of view, that's probably what it should be: an occasional treat.
Take a music bath once or twice a week for a few seasons, and you will find that it is to the soul what the water-bath is to the body.
Californians are people who insist on growing their own vegetables, but they won't dig up the pretty lawn, won't plant anything for fear of getting dirty, and they use fragrant bath salts from The Body Shop instead of smelly compost.
I could tell that my parents hated me. My bath toys were a toaster and a radio.