If the dry mouth is caused by insufficient fluid, you can take medicines such as Nourishing Yin and Clearing Lung Pills and Yin Deficiency Stomach Pain Granules to produce fluid. There is no such thing as taking any medicine to produce fluids quickly. 1. Nourishing Yin and Clearing Lung Pill is composed of Di Huang, Xuan Shen, Mai Dong, Bai Shao, Chuan Bei Mu, Mudan Pi, Mentha piperita, and Glycyrrhiza glabra. It has the effects of nourishing yin and clearing the lungs (getting rid of lung heat by nourishing the lung fluid), clearing heat and relieving sore throat. It is used for dry and sore throat, dry cough with little phlegm. It is forbidden to be taken by diabetic patients; it is also forbidden to be taken by people with phlegm-dampness congestion, which is manifested by phlegm that is thick and sticky, or thick and lumpy. 2. Yin Deficiency Stomach Pain Granules is composed of Northern Radix Panax Ginseng, Ophiopogon, Dendrobium, Neem, Rhizoma Polygonati Odorati, Radix Paeoniae Alba and so on. It has the effect of nourishing yin and benefiting the stomach (replenishing yin fluid and enhancing the function of stomach and internal organs), easing the middle and relieving pain. It is used in treating vague burning pain in the stomach and epigastrium caused by insufficient stomach yin (insufficient yin fluid in the stomach), dry mouth and tongue, dullness (lack of appetite, decreased food intake), dry heaving, and chronic gastritis with the above symptoms. The above medicines should be used under the guidance of a Chinese medicine practitioner.