"Oh," Steven says, looking back to the glass he'd just emptied. "Sure!" He runs back over to the counter and starts filling up the glass again, smiling a little to try to put her at ease.

Despite the lingering feelings of ill ease, Steven takes the question to be a sign that things are still cool.

"I think usually they just have a water tank or something! Dad always kept a big water jug in the van when we were away from the car wash. I don't know how this place works, though... it never seems to run out! Probably water magic."

Magic is the answer to most mysteries here.