We may shiver a bit . The electrical current in Israel is 220 Volts. Electric adapters and converters should be purchased prior to arrival in Israel, so it is wise to determine if your appliances will require them. Some form of medical insurance is advisable - at least enough to pay for an unexpected plane ticket home. Larger hotels often have medical doctors on staff or they will call one in an emergency.
Good pharmacies are easily available.
However, if you require a particular medication, it is suggested you bring your own supplies. Many, if not most, Jewish-owned shops, restaurants and museums would likely be closed during these 8 days of celebration. At best, some may be open for limited hours. Be aware and plan accordingly if you plan visits to these establishments.