Howdy Yonatan; If the Gazans remain belligerant towards Israel, she can cut off the electricity, seal the border, force the UN and NGOs to go through Egypt instead, and retaliate militarily. However, cutting off water supplies to the Gaza Strip would be Midiaeval seige warfare and you know how that goes. The first to die would be the young, the old, and the infirm. The militants would be the last to drop. The whole civilized world would freak out (including me). In any case, Israel will continue to supply water to the Gaza Strip at the same rate she has done in the past, but it won't be enough because of the Gazans' population growth and the over use of their own ground water. It's a very serious problem that the PA or Hamas or whoever is in charge in the Gaza Strip needs to address IMMEDIATELY. The world does not want to see scenes of two-year-old kids dying in their mothers' arms due to thirst or due to an epidemic caused by lack of water on their TV screens.
Palestinians, IDF clash in Jalazone after funeral of teen killed by IDF on Friday (Haaretz)
from the article: Of course, Egypt is to blame