An electricity converter. Everything over here is 220 and you will blow out all of your 110 stuff listed by well-meaning friends above if you don’t bring a converter.
If a genie offered you 1 wish, what would it be? 10 wishes. K’moi kein, the one thing you should bring to sem is a shipping container filled with all the things you will need.
I mentioned things that are either more expensive in Israel for an inferior product (makeup) or just nice to have your regular brand for (sanitary products). This was also advice given to me by Israelis who prefer the American stuff.
I spent a year eating Telma cornflakes- I just prioritized what I felt was important enough to bring.