There are ice makers that come with the fridge which you have to fill with water, but I assume you're talking about an ordinary ice tray.
You fill the ice tray with water (drawn from the faucet), and you stick the ice tray in the freezer. To make ice.
"Make some ice, why don't you. We're all out."
"How do you expect me to do that?"
"It's pretty simple. First, you get an ice tray. It's that plastic thing with compartments. That's how ice cubes are formed. You fill the tray with water. From the faucet. And you stick the tray in the freezer. And then you just wait until all that water freezes up and turns into cubes. You then remove the tray from the freezer and twist and squeeze and knock it until all the ice cubes are out."
I'm pretty sure you'll be able to construct something, well, constructive, from the above description.