If you were stuck on a deserted island, What three things would you want there with you

If I were stuck on a deserted island, three thing I would bring is water, because I have to survive. A iphone, to call help, and a axe, because if a animal try to attack me, I will use my axe, if I take down a animal I will eat the meat. So, common down below, is this important, that I have this stuff.