That many druids should easily be able to make enough goodberries to feed all those refugees with no real strain.
I was just going to say, Goodberries, and Create Food and Water. Problem solved.
Low level spells, could keep everyone fed for a very long time. But, I guess they needed a reason to want to throw out the teiflings. It would be interesting if one of the druids mentioned about the spells though, and was like, "Hmmm... Wonder why Kagha doesn't just go that route?"