Cut the fruit into appropriate sizes, unscrew the lower cup, turn the cup upside down, and the tip of the juicing part is up. Put the fruit on it, press the juice into the upper cup, and then tighten the lower cup lid. Open the top cover and pour in warm water. If you like sweet taste, you can put a proper amount of rock sugar according to your personal preference before pouring water, and then screw on the lid. After the crystal sugar melts, you can drink it.