Folks have been asking which bottle I used.
I think it's like this one- http://www.mec.ca/product/5041-430/thermos-stainle...
It's a thermos with a one-hand pop top and a pretty wide spout.
I filled it with warm e-load. At one point it wouldn't pop open but I held the lock where my breath would hit it and it thawed quickly.
Not super-light, but always worked. I would have refilled it at AS 2 or 3 but the shivering volunteers weren't quick on the draw.