What kind of water is used for Sean's spicy hotpot?

Sean's mala Tang is made of pork bone broth. The fermentation method is as follows:

Preparation materials: pork bones, ginger slices, cooking wine.

Wash the pig bones first and drain them.

Second, rinse with clear water and drain.

Third, boil boiling water in the pot, and put ginger slices and pork bones into the pot.

Fourth, after the fire boils, remove the residual blood foam and cook for about 10 minute.

5. Then turn to low heat and stew for about 3 hours.