Rice wine can be fermented twice if it is not sweet. The fermented rice wine juice is fermented for the second time with water, distiller's yeast and white sugar for 24-48 hours. Try not to touch the rice wine until it is ready. In the middle of fermentation, you can feel whether the outer wall of the container is hot or not. During the fermentation, the temperature is kept between 30℃ and 32℃. You can put it by the heating, or you can put a hot water bag beside the container, and you can change hot water in the middle.