Camel's humps do not store water. They are mounds of fat

Nice to know. But creepy looking photo

You mean there are actually people past elementary school who think camels' humps will gush water out if you stab them? Wow.
Next thing you know there'd be college graduates thinking spiders are insects.

Well, fat consists of mainly water so you could say the hump is basically filled with water.

It *is* a reservoir of water...which is stored in the fat.
Also, the pic is of a dromedary, not a camel.