It's best to put some rice in black rice porridge, but don't put too much black rice, otherwise the color of porridge will be very dark, and the teeth will be the color of black rice after eating. The ratio of rice to black rice is preferably 2: 1. As for how much water to put, it depends on whether you want to drink thin or thick. It will take about an hour and a half to two hours to finish. You can watch while cooking. Rice is cooked quickly, but black rice is cooked slowly. You can eat it as long as it blooms.