I say, and with God's success: The chicken that is kept in a house and fed, its leftover water is pure and its use is not disliked; because it does not find the excrement of others to mix with, and it does not mix with its own excrement, but rather it observes the grains among it. This is unlike a chicken that roams freely in filth, as one cannot know the purity of its beak from its impurity. Therefore, it is disliked to use its leftover water for purification as a matter of preference when there is something else available that is not disliked. However, it is not disliked in the absence of pure water; because it is pure and it is not permissible to resort to dry ablution (tayammum) when it is present. See: Maraqi al-Falah 32, Al-Sayah 1: 465, and Radd al-Muhtar 1: 149, and God knows best.