Before items like soy sauce, oyster sauce, etc. were commercially produced on a large scale, where did people get them? Did they make them at home? Were there special home-businesses or shops which made these sauces in-house as a specialty, and people would go to these small businesses to purchase them? If the latter is the case, are these sauces still available in this way, and the mass produced bottles only more popular with Chinese diasporic communities? Or do people in China also use mass produced bottled products?