YOU SAID:

So i went to the bathroom and the toilet was full to the brim with brown water

INTO JAPANESE

それでトイレに行ったら、トイレは茶色の水でいっぱいだった

BACK INTO ENGLISH

So I went to the bathroom and the toilet was full of brown water.

INTO JAPANESE

そこでトイレに行くと、トイレは茶色い水でいっぱいでした。

BACK INTO ENGLISH

So I went to the bathroom and the toilet was full of brown water.