Do I need to receive any special vaccination before my trip to Israel?

Israel is a modern, developed country with levels of health and hygiene equal to those of Western countries. Visitors entering Israel are not required to undergo vaccinations prior to their arrival.

For more information, visit this page.

Can you drink tap water in Israel?

You can drink tap water. But, you will also find mineral water everywhere. It is important to make sure you drink a lot, especially when out walking and on hot days.
From The Israel Ministry of Tourism