One good thing about the soggy Pacific NW is that most of the time it isn't cold enough for us to have this problem, at least not with water bottles. I've had water bottles freeze at night, but not solid, even on a 15*F night. As DTape says, turning the bottle upside down means that the last place to freeze is around the opening. If it's way below freezing, starting with warm or even hot water and an insulator sleeve should help. I agree that a hoser system (which I don't use) is probably not practical when it's way below freezing in the daytime.