YOU SAID:

all he had had to drink was water and monster

INTO JAPANESE

彼が飲まなければならなかったのは水と怪物だけでした

BACK INTO ENGLISH

All he had to drink was water and a monster

INTO JAPANESE

彼が飲まなければならなかったのは水と怪物だけでした

BACK INTO ENGLISH

All he had to drink was water and a monster