I just went through a horrific experience with extreme shipping stress that I was ill prepared for.
I lost 9 out of 13. The chicks had been flown to be in cargo. Not good.
I read about 'miracle water' and made a batch for the 4 survivors.
One of the 4 started to fail and I aggressively dosed her with the miracle water with some poultry cell in it and I saved her. She is a bit smaller than the other three but is extremely vigorous and active now.
To make the miracle water add one large minced or crushed clove of garlic to a half gallon of warm water, add one tablespoon organic apple cider vinegar and 1/4 cup raw honey. Mix it well and let it steep. Because you need it now just draw out a syringe of it and mix it with a little poultry cell or another poultry vitamin supplement and start working on getting that into the chick. I gave 1/2 ml of the mixture every 30 minutes and kept the chick on a heating pad.
After trying to save the first 9 chicks and them dying every time, I was not convinced I was going to save this 10th one. But after 2.5 hours she was fluttering around the indoor brooder, eye wide open and chirping away. Again, skeptical, I decided to put her back under the brooder plate in the maternity ward of my coop with her hatch mates expecting her to be gone by morning. Needless to say, I was delighted to go out to the coop and find her zipping around with her hatch mates greedily eating the food in the trough and drinking the miracle water in the baby bottle.
I think that what really mattered was that I started treating that chick as soon as she started showing trouble. Any delay and all bets are off.