What are causes of dry mouth and thick mucus? i drink a lot of water and i am not on meds, what could be the issue?

Occluded airway: Dry mouth not related to maintenance medicine use, maybe a sign of an altered airway causing one to breathe through their mouth almost all the time. Have your dds/dmd check your bite. Some bites are predictors of a limited airway. Then see an ENT for an air way evaluation. Loud snoring during sleep , awaking to your own snoring are tips of this. Many dds/dmd now treat sleep disorders.

Call your dentist: You might not be producing enough serous saliva from the parotid glands and the submandibular glands. The parotid glands are in front of your ears and the submandibular glands are under your tongue. I would recommend you call your dentist and tell him that you have dry mouth and should you be seen by him or be referred to an oral surgeon to determine cause of lack of saliva.