YOU SAID:
My poo went into the toilet and into the sewer water
INTO JAPANESE
うんちがトイレに入って下水道に流れてしまった
BACK INTO ENGLISH
Poop went into the toilet and went down the sewer
INTO JAPANESE
うんちはトイレに入って下水道を下った
BACK INTO ENGLISH
The poop went into the toilet and went down the sewer
INTO JAPANESE
うんちはトイレに入り、下水道を下った
BACK INTO ENGLISH
The poop went into the toilet and went down the sewer
That didn't even make that much sense in English.