The point of a bottle is to have everything you might depend on in a compact slick protective container, which you can effortlessly toss into whatever bag you are taking with you on a potentially dangerous trip. Many bags even have a dedicated mesh pocket for such a bottle. If you need the bottle for water - just empty the survival content into that bag or into your pockets (hence the volume of the bottle limit) and fill with water. Water sources is not an issue in Alaska.