Thanks for the recommendations once again! For now I decided I’d like to read 水たまりで息をする, a probably stranger story (a man starts avoiding tap water and stops taking baths) written by the author of おいしいごはん。I’ve even set up a thread in case anyone is interested to join, now or later (the book is on the expensive side, but hopefully there will be some coin-back sale soon for those interested).
I had a quick look, and it’s short and free (déjà vu) and hopefully not as hard as 糞尿譚, so why not? 