Schultzy
Others may disagree but one of the cardinal rules I learned as a boyscout "never ever have any liquid, water or otherwise, above or in your sleeping bag at anytime." I suppose a sealed bottle inside another sealed container might be ok, and I'm sure lots of people get away with this BUT it could leak and I hate wet sleeping bags.
I put warm water - melted snow - into my insulated water bottle and wrap it in my goretex jacket and put it inside my pack. Some people put it lid down since water does seem to freeze from the top down, but I've only once had a problem with this.
Insulated water bottle. Cut pieces of blue foam pad to wrap tightly around bottle, cut a round piece for the bottom and use duck tape, don't worry about the lid.
Jim