To make handmade noodles, what is the best ratio of water to noodles?

If flour is 300g, cold water 140ml and salt 1.5-2g. You can try to follow this ratio.

The practice is: put the salt into cold water to turn it into salt water, and then pour it into noodles and knead it. The freshly kneaded noodles will be hard, not smooth and not wet. Don't worry, first knead 15 minutes, and then knead for the second time. This time it will be smooth and moist, and then knead for 15 minutes. If you are afraid that the noodles are not strong enough, you can try to knead them for a while until you like them.

In the process of kneading dough, if you feel that the dough is not strong enough, you can try to add some flour, but according to my personal habits, I think this proportion of dough is just right. If you don't like adding salt to the dough, just knead it with cold water.