Lisa - I'm so sorry you lost two and so HAPPY one wasn't Lady B.
I've been so worried about my 8 girls that have gotten quite large, fluffy, and fully feathered. I'm in Olympia where it's not as hot as you at a record 104' yesterday.
With the raise in temps, I went from 7 of 8 chicks laying to 4 on Tues and 5 yesterday and today. Mine are 2 wks younger than yours - 2 RIR's, 3 Buff Orp's, and 2 Barred Rocks.
They run around with their wings out. At night, instead of being all bunched up next to each other on the roost, they've been all spread out with the wings out again.
I've been providing two sources of water - one in the coop and one in the run.
My girls spend a lot of time in their coop where they dig way down where it's a little damp and cooler.
My three little banties that are in the dog house turned tractor/run in the front yard lay in the grass. I've put boards up on the south and west sides so they have shade. This morning, I put a large kitty litter container that I froze water in last night, in their run. I also turned on the sprinkler and directed it towards their run so they would get the mist.
At mid-day, I've had my daughter take out hunks of cold watermellon.
Today for the first time I've seen the big girls pant.
I'm so looking forward to lower temps.
I'm wondering if the little waterers you have that are hooked up to a hose is running hot water from the hose heating up?
I know HOT water runs out of the 100' hose I have running from the backyard to the chicken coop at night when I refill their buckets.
I hope you don't lose any more birds.