There seems to be some confusion about a couple of things that I’d like to clarify.
When pro-Israelis say that Israel “provides” Gaza and the West Bank with water and electricity, it’s in the same way that your local store “provides” you with groceries. They sell them electricity and water.
It’s also worth mentioning that the majority of the water provided to Palestinians comes from water aquifers in the West Bank. i.e. they forbid us from drilling for water and sell us water extracted from Palestinian lands.