Only if you will use it on Shabbos. May I put a bottle of milk in the freezer so that it doesn't go bad? Yes. See here: https://asktherav.com/7003-its-friday-night-after-the-meal-may-i-put-my-leftover-chicken-in-the-freezer-for-later-on-in-the-week-or-do-i-need-to-put-in-the-fridge-is-putting-it-in-the-freezer-an-issue-of-hachana-on-shabbos/…
