Homemade Solar Water Distiller - turns dirty water/saltwater into clean drinking water! - how to DIY

how to make a solar water distiller using only a bowl, plastic wrap, rubber band a cup and a rock. easily distill seawater saltwater and dirty water. makes water fresh and clean. cost me $ to make three of them. the 3 small distillers made 1/2 cup of fresh water. i think if the plastic wrap was at a steeper angle the production would be doubled