Ice does damage when it forms with no space for expansion. If you're concerned about getting a solid chunk of ice from melting and refreezing, rain, etc then just pack the skimmer with pool noodle foam. Cut up a noodle and pack some chunks in the skimmer. Can even whittle a piece down with a sharp blade and shove it in the skimmer pipe after you disconnect the hose. Can do the same with the return eyeball fitting. Use a relatively fresh noodle, one that isn't starting to deteriorate, or the white closed cell packing foam...eccofoam. Same as the noodle stuff.
Al