"So I think there are often such scenes in Japanese animation. There is a cartoonist in every animation. In order to catch up with the manuscript, these cartoonists often use a small bottle (similar to a bottle of righteousness) to drink something. "
I can only think of canned coffee. Many works reflect the relationship between the protagonist and coffee, especially black coffee, when he needs to stay up late.
All I can think of is, for example, the protagonist in Little Half-length and Kamikita Komari bought coffee while watching the stars on the roof.
This kind of thing doesn't really need to follow the animation. Personally, I think coffee tastes good, and it is also good to drink it if it is refreshing.
Some people think that China's traditional tea is also very good, which is ok. Depends on what you like.
If there are three kinds of drinks in Japanese anime, what I remember most is.
1. Dr. pepper (Chinese name: Dr. pepper)
2. Coke
3. Coffee