1. Wholesale market: There are some large food wholesale markets or fresh food markets in Ganzhou, Jiangxi. You can go to these markets and contact wholesalers or suppliers directly to find out if there is any supply of temporary food.

2. Food producers: Contact local food producers and ask if there are any foods that need to be processed or sold. Some manufacturers will sell these foods because of inventory management or overproduction. You can discuss with them whether you can get first-hand information.

3. Online platform: Look for suppliers or buyers of food to be listed in major B2B platforms, wholesale websites or food trading platforms. Generally, these platforms have suppliers or merchants who publish the sales information of temporary food, and you can contact them to obtain the supply information.

4. Food recycling channels: Cooperate with food recycling or reuse organizations to find out whether they have channels to supply temporary food. These organizations usually recycle temporary food and reuse it through certain processing or sales methods. "Primary source" refers to dealing directly with suppliers or producers of goods, that is, communicating and cooperating with the original source of goods, rather than through middlemen or other third-party channels.