Thank you so much, everyone! YOU GUYS ROCK!
I've been taking many of your suggestions.
The chickens have stayed outside through the fire (which is 90% contained as of last night!
)
I completely opened up their coop to try and keep it cool. I have given them TONS of frozen treats (strawberry tops, frozen watermelon & cantaloupe). I have also used a couple of cat litter boxes with water and ice cubes, which they drank out of.
They didn't lay as much for a while and one of the hens has begun serious molting and has gone broody. However, I think that they've weathered the storm (so to speak) fairly well. We are looking forward to and are praying for our traditional July monsoons!
Thank you for all of your wonderful advice and your prayers!