Urge to drink water. It is happening.

I have a strange feeling of drinking gallons of water , preferably cold and chilled. Though I am not suffering from dehydration and moreover my Sugar and PP results are within normal range. When I start taking water I feel like to have all of it non-stop. It soothes my mouth and throat area. I have tried to limit my water intake to avoid frequent urination but whenever I do so my mouth starts smelling bad and swallowing food becomes worse. Initially I thought these all are happening due to frequent urination but the Kidney specialist did some tests and find my kidneys, prostarte working perfectly. He rather suggested me to limit the water intake. The day I intake less water I dont feel the urge to urinate but my mouth, neck and throat feels very unexplained taste. Kindly suggest why it is happening.