Yeah, they have wide-mouth bottles - Slam? Big Gulp? What have you. I dont drink any of those either but I developed a habit so I could have enough bottles before the trip. If you dont want to be buzzing from all the caffeine, you're really better off ordering from the Catalog Mike Wise posted.
Maybe I don't drink enough Pepsi, but I can't picture in my mind how the heck you get the fish through the 1 inch hole into the bottle. Or do they have wide-mouth versions.