Originally Posted by 2manybikes
There are a few kinds of stainless, vacumm insulated water bottles (like a thermos). They will keep your water from freezing all day. They are not expensive.
With the kind of distance that Data Junkie is doing, stopping to open a vacuum bottle would be a pain. Also here on the high plains, you would not believe the amount of water you can go through in the winter! On a cold morning, I can easily go through as much water on my hour ride to work as I would on a hot summer day. Sometimes more.