The water is safe to drink. Hebrew and Arabic are the official languages of Israel. English is a required subject in school. All street and road signs and most commercial signs are in Hebrew, Arabic, and English. Israel is 10 hours ahead of Pacific Time and 7 hours ahead of Eastern Time.
Israeli sockets are usually three-pronged.
Shavers, travel irons, hair dryers, and other small appliances may require transformers or adapters. These can be purchased in Israel if you don't find them before you leave. The current exchange rate is between 3-3.5 shekels to the dollar. Many merchants will take dollars and give change in shekels. Surprisingly, when you do this, the rate of exchange is usually quite good.