Responses
I mean it's raining outside so I wouldn't be suprised if the water drips down into their place and gets naturally filtered out by the rocks and and soil. Is it entirely clean water? Nah. But do they have a choice? Nope. They can still survive by logic in this case.
Good point, but I think the author just didn't really thing about it
I'm only reading ghe officials and I'm stunned how she just goes "we just have to hold out a few days"
Girlie, without water you'll love 2 days max. But this is fiction with supernatural elements so whatever I guess.