The drench is the stronger oral dose that you give in addition to the medicated water.
See this thread: https://www.backyardchickens.com/threads/corid-oral-drench-instructions.1211991/
Then if she isn't drinking well on her own you can use a dropper or oral syringe or dip her beak regularly to get the regular medicated water into her also. I would try to get her to take some every hour or so. As she starts to feel better she will start drinking on her own.
Again, the drench is given once a day IN ADDITION to the regular medicated water. The medicated water should be the only water she gets. If you make a mash for her and add water use the Corid water.
See this thread: https://www.backyardchickens.com/threads/corid-oral-drench-instructions.1211991/
Then if she isn't drinking well on her own you can use a dropper or oral syringe or dip her beak regularly to get the regular medicated water into her also. I would try to get her to take some every hour or so. As she starts to feel better she will start drinking on her own.
Again, the drench is given once a day IN ADDITION to the regular medicated water. The medicated water should be the only water she gets. If you make a mash for her and add water use the Corid water.