Feel free to go straight to the 3rd floor, there are basic rags. You can have a cheap snack in the basement, but it's purely Chinese cuisine. The price tag is nice for everything.
There is a supermarket next to our hotel. I liked it and had no desire to shop elsewhere. Tea, sweets, Beijing beer, souvenir vodka with ginseng, seasonings...
The supermarket is located in China, there is also a hotel there, very convenient! You can buy almost anything for a reasonable price. When I'm in China, I'll come here again ☝