Generally, non-franchised stores have two kinds of purchase channels that are generally applicable in China.
One is the Taobao or Alibaba platform of Taobao Department, and you have everything you want. Whether it's raw meat or semi-finished lunch boxes with sauce, everything is easy except vegetables.
The other is that cities in every province have meat joint factories and wholesale markets. Chicken legs, whole chickens and whole sheep are sold by the box, and you basically have everything you want. Half of the catering industry in a city goes to this market to get ingredients. You can look for them locally in your city.
edible risk:
as long as it is made in a standardized way, the food safety risk of fast food packages is far less than that of on-site cooking in stores.
The biggest food safety risk in the catering industry comes from microorganisms. The fast food package is thermally processed at the front end, and it needs to be reheated when it arrives at the store. The risk of food poisoning will be greatly reduced if the food is fully heated. Moreover, the mode of fast food package reduces the number of people involved in food production, and the risk of food safety will naturally decrease.