The snake will be fine without water for the duration of the drive. Just keep him warm and dark and secure.
As for the new tub you're making...you may need a second heat source to keep the "cool" side warm enough. Set it up as you planned and give it a few hours to adjust and settle....then see what the temperature range is. If it's too cold, zip out to a petstore and buy a zoomed (or other brand) UTH and a lamp-dimmer from the hardware store....and that should do ya just fine.
So long as it's warm enough, the snake can stay in its traveling box for a day or so until you get its new home all set up and tested and running smoothly.
EDIT: Oh yeah....blasting the music would probably not be a good idea, but any reasonable volume should be fine.