That dryness went on for about 3 months for me.
I googled it and from what I found, it is the liver trying to cleanse itself with as much non alcoholic fluid as it can get. It's an amazingly regenerative organ.
Pre quitting drinking I had liver tests that had my Dr say I was either early stage cirrhosis or on the verge of it, 3 months later when the constant thirst abated and I got retested. Perfectly normal healthy numbers on the test.