Toilet Water

My husband is giving Mady a bath when she asks him, "Where does this water come from." He proceeds to tell her that all the water we use goes down the drain and to a water treatment facility so we can use it again.
Her reply : "So I'm taking a bath in toilet water?"

I enter the bathroom having no idea the aforementioned conversation has occurred. Seeing something black fluttering in the water, (knowing it is probably mold from inside a squirt toy...disgusting) I ask Mady, "What is that in the water right there by your foot?"

Mady: "I don't know...I'm pretty sure it's part of Zac's dead fish."