Thanks! The neverreach system sits behind the saddle, with a tube that extends up between the handlebars. See: http://www.neverreach.com/page/page/276159.htm
It holds 64 ounces of fluid, so refills are not often necessary. I'm doing a 1/2 ironman in 2 wks, and one container will come close to fulfilling my needs. That said, one can refill by grabbing a bottle at the beginning of an aid station, empty it into the neverreach, and drop it at the end of the aid station. I'm slow, it takes me about 70 yards to get done, and if an aid station is 40 yards, I won't be able to drop in time.