The main use of bowls for a monk is to serve food. In India, Nepal, Thailand, and other countries, monks use metal bowls. In addition to being the instrument of religious ritual, the music bowl is also widely used in daily life. Many families in the Himalayan mountains use bowls as their daily food utensils. In the local custom, bowls of warm food can be given to pregnant women who have just given birth. Ayurveda in India believes that bowls can promote rehabilitation and recovery. In the past, since there was no electricity or refrigerator, people put extra food in the bowl to seal for better keeping. So its original function is also equivalent to refrigerators.
more about: How to use a singing bowl