Qutayba bin Sa'id bin Jamil قتيبة بن سعيد بن جميل · The Book of Water

"The Messenger of Allah (ﷺ) was asked about water and how some animals and carnivorous beasts might drink from it. He said: 'If the water is more than two Qullahs, it will not become filthy.'"

"The Messenger of Allah (ﷺ) said: 'None of you should perform Ghusl in standing water while he is Junub.'"

"If a dog licks the vessel of any one of you, let him wash it seven times, the first time with dust."

It was narrated from Al-Hakam bin 'Amr that the Messenger of Allah (ﷺ) forbade a man from performing Wudu' with the leftovers of a woman's (water for) Wudu'.