Both cold water and hot water can be used, and tap water is usually used. Except in winter, cold water can be used in addition to warm water. Whether it is cold water, hot water or noodles, it has no effect on the quality of cold noodles. In other words, how to make cold noodles has nothing to do with noodles. As far as dough is concerned, both soft and hard are acceptable. Generally speaking, it is recommended to be soft and hard, because soft labor is vigorous and machine-saving. What's more, the dough is soft, and it is faster and easier to separate when washing your face.