This document describes the world's first smart shower called Evadrop. It attaches to existing shower pipes and heads and allows temperature control by only starting the water flow once the desired temperature is reached and maintaining it. The smart shower uses flow sensors to control water flow based on the user's proximity and stops the flow when the user leaves. A mobile app tracks water usage, alerts the user if showers are longer than usual, and suggests ways to reduce water wastage. The smart shower costs $199 and is presented as a way to save water for future generations.