From this site that I haven't explored beyond this yet:
"We’re all familiar with this scientific error from Sunan Abu Dawud, which I often use in my debates:
Sunan Abu Dawud 67–I heard that the people asked the Prophet of Allah (peace be upon him): Water is brought for you from the well of Buda’ah. It is a well in which dead dogs, menstrual cloths and excrement of people are thrown. The Messenger of Allah (peace be upon him) replied: Verily water is pure and is not defiled by anything.
Things get worse, however. In the following passage from Ibn Majah, we learn that it’s okay to drink water with a dead donkey carcass floating in it!
Sunan Ibn Majah 520–It was narrated that Jabir bin Abdullah said: “We came to a pond in which there was the carcass of a donkey, so we refrained from using the water until the Messenger of Allah came to us and said: ‘Water is not made impure by anything.’ Then we drank from it and gave it to our animals to drink, and we carried some with us.â€
And let’s not forget this gem:
Sunan Ibn Majah 521–It was narrated that Abu Umamah Al-Bahili said: “The Messenger of Allah said: ‘Water is not made impure by anything except that which changes its smell, taste and color.'â€
This is, of course, totally false. Water can be filled with deadly germs that do not affect smell, taste, or color.
Let’s conclude with a classic:
Sahih al-Bukhari 5782–Allah’s Messenger said, “If a fly falls in the vessel of any of you, let him dip all of it (into the vessel) and then throw it [i.e. the fly] away, for in one of its wings there is a disease and in the other there is healing (antidote for it) i.e. the treatment for that disease.â€
If I were a Muslim looking for something miraculous to justify Islam, I would argue that it was miracle that Muhammad’s followers didn’t all die from the germs and diseases he exposed them to with his horribly unsanitary rulings."