Ok, so Bill, George, and Tom were going to a far away, hot, deserted island. They each got to bring 1 thing. So Bill brought food.
George asks, "Bill, why did you bring food???"
Bill answers, "So we have something to eat when we get hungry."
George brought water.
Tom asks, " George, why did you bring water???"
George answers, " So if we get thirsty we'll have something to drink."
Tom brought a car door.
Bill asks, "Tom why did you bring a car door????"
Tom answers, " If we get hot we can roll the windows down."