I want to keep ice frozen for a long time without freezer?
Without the freezer the Ice will melt, but in order to decrease the melting process, put it in an Ice Box or try to keep it in a cold place away from any heat source.
Put the ice outside during the winter.
You should try to, if you are traveling, put it with more ice in a container (could be a lunhbox) that keeps the cool in (make sure to have the ice in a bag)
You need an esky. I think you'd call it an ice box.