Still sour crop or something else?

[Eggcessive]

Some people use acidified copper sulfate to treat sour crop. Dosage is 1/4 tsp of powder to each gallon of water. I would chose one treatment over another, and not try too many different ones at the same time. Here is a link on sour crop and where to buy it:
https://www.jefferspet.com/products...WNKMw6cG8RRXABt2cDwiSb8LlmZBO07gaAjShEALw_wcB

https://the-chicken-chick.com/chicken-anatomy-crop-impacted-crop-sour/