"Average per capita consumption throughout the West Bank is 66 liters, two-thirds of the minimal amount needed according to the WHO. These figures include water for livestock, meaning that the water consumed for personal use is even less.
In comparison, average daily water consumption in Israeli cities is 235 liters, and 214 liters in local councils, 3.5 times higher than Palestinian consumption in the West Bank." (Thanks Marcy)
And remember, the situation in Gaza is ten times worse.