Sour Crop Treatment

[bumblerumble20]

Hello,
Please give advice to the best way to treat sour crop. I have been trying to figure out what is wrong with this bird and have finally figured it out. Please advise.
Thank you!

 

[azygous]

You'll find the basics here. https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/