You can try looking at this manga posted by a Japanese person that was detained for marijuana possession https://xcancel.com/kime_neko/status/1634511023167381504. It's in Japanese, but you can use a machine translator and/or look at the drawings.

The facilities and food look slightly better (maybe because it's a detention centre in Tokyo), but it mostly matches. Although the mangaka seemed to have a much more positive outlook on it, probably because they could read all the Japanese books they wanted and speak to their cellmates in Japanese.