Priority guarantees 2-3 day delivery. The post office had said they would arrive Friday morning, which would be exactly 2 days, but they did not come when they were supposed to.
Fortunately, we lost only one more over the weekend, and all are doing well now.
As for the water, chicks can and DO develop what is referred to as "water poisoning": if I recall correctly, or something similar anyway. People can also be affected in this way. In cases of extreme thirst, they will on occasion drink in excess and die from it. We lost two turkey poults that way I suspect, and it wasn't until after they died that several people on this forum alerted me to the possibility. It is advised that if they appear excessively thirsty to allow them to drink at short intervals and then remove the water for BRIEF periods. Yes, they DO need access to water at all times, but allowing a 10-20 minute interval between drinks for the first few hours is in no way dangerous to them.