Alright, that is just genius. So copying this! Where'd you get the giant size steel water bottle? Got any pictures of your set-up?

For rides like the OP describes, I usually use my minimalist Camelback type bag. I usually don't like riding with a bag, but with a very minimalist Camelback one isn't tempted to put too much gear in there along with the water. Also helps with staying hydrated, as the mouthpiece is right there. I often bring this bag with me on my tours as well.