True. She takes the waterskin- after a battle like that, if she had any authority, she's probably force everyone to drink water like demons guzzle wine. It is a quarter full, but she goes ahead and fills it with the spring water, which is indeed clean enough. A bit colder compared to their skins and hands, too.

"Here you go." That's better than lying on the floor, at least. Amane's still confused over... exactly what Vas is, but since she gave her the waterskin, their biology is probably fixed to drink water too.

"Most of this area is full of life... a welcome change. There should be whatever we need around here." Even for blue-skinned... alien things.