I am going to tag @azygous who may be able to advise on whether to give molasses during sour crop treatment. Here is a typical tube feeding kit for chickens:
https://www.amazon.com/Agri-Pro-Enterprises-Lamb-Feeding-1-Syringe/dp/B08RHDVBB9
https://www.amazon.com/Agri-Pro-Enterprises-Lamb-Feeding-1-Syringe/dp/B08RHDVBB9