Nobody is talking about the grey water she was about to drink??
The first girl to die is in the bathroom and fill a coup with water... later then we see the cup filled with GREY WATER.
Nobody notices that?
Na it's just warm water, it can be cloudy. It clears after it sits.
shareI'm not sure why would she want to drink hot water, but you're right:
https://www.quora.com/Why-does-hot-water-from-the-tap-sometimes-look-grey
It also happens with cold water too, though:
https://www.louisvillewater.com/WaterQualityHelp#cloudyfoamymilky