First off, eating is a lot easier when dry mouth is minimized.
If a dry mouth is preventing you from eating well, tell your doctor or nurse. There are some medications that help manage a dry mouth, but your doctor can’t prescribe them if she doesn’t know you’re struggling.
Ask your nurse for a mouth care plan, such as when and how often to brush your teeth, whether you should use any
Ask your pharmacist about gums, saliva substitutes, mouth moisturizers and other products made especially for a dry mouth, but avoid commercial mouthwashes that contain alcohol, which can dry the mouth further.