There are many causes of dry mouth. Dry mouth most commonly occurs as a side effect of medications that cause decreased saliva production, including high blood pressure medications, antihistamines, antidepressants, diuretics, nonsteroidal anti-inflammatories, narcotics, and many others.
Liquid diet: The Liquid diet is the restriction of solid food intake, and replacement of solid food with liquids. In hospitals, liquid diets are prescribed by doctors for a number of reasons for patients who are unable to consume solid foods. Liquid diets may be prescribed following surgery or as a preparation for certain medical procedures.
Here's an example of a daily meal plan filled with foods you can eat on a full liquid diet. It has around 2,000 calories, but you can alter the amounts depending on your appetite and calorie needs. Breakfast. One cup of fruit juice. One cup of strained cooked cereal. One glass of water or cup of coffee.