1. Fruit yeast method: select some ripe fruits, such as grapes, apples, pears, longan, etc., wash them and cut them into small pieces, put them in a glass bottle with a height of 3/4, add sugar equal to the amount of the fruits, then cover them with a mouthcloth, put them in a ventilated and dry place, stir them once a day, and keep the humidity in the container appropriate, and you can get yeast after one week.

2. Flour yeast method: mix flour and water evenly according to the ratio of 1: 1.5, then let it stand at room temperature and stir it once a day, and you can get flour yeast after three days.

3. Rice yeast method: soak rice in clear water for 24 hours, pour out the soaking water, mash rice with water into paste, pour rice slurry into a bottle, add white sugar, add mouthcloth, put it in a warm and ventilated place, and stir once a day to get rice yeast in about seven days.