Sour crop......ugh! I have dealt with more than my share of this. Two Crows saved my hen from this. Said hen lived for a year after being pulled back from deaths door twice while I was treating her. She developed it again this fall. Sadly I couldn't save her this time and had to euthanize.
I have another hen in the garage now for the same thing. A Rhode Island Red hen. She was lethargic, I picked her up and fluid ran out of her beak. Started off treating with wormer and Corid. Followed up by treatment with miconazole. She was yeasty. Now, three weeks later, she has been packing in the feed and consuming a quart of water a day, thus flushing said food in floppy piles on the dog crate floor. She is, however pooping normally and has passed several cecal poops, instead of the tiny greenish pellets surrounded by water that she was passing in the beginning.
We lost 6 chickens this year from predation by a local fox. And we lost our beloved Sweetheart from sour crop probably due to some internal damage caused by the blockage she had last year. She had a huge rope of hay blocking her digestive tract. It took lots of treatment to clear it out. Dulcolax helped with that, I believe.
My spirit/soul is exhausted from the stress of treating chickens and their loss. I need a happy ending.