Hello and Welcome to HealingWell. Some of the meds cause excessive dry mouth. I keep a bottle of water on my night stand and if I wake up thirsty I can just take a swallow of water.
Strange as it may seem, I find that drinking water with salt, but not table salt helps my dehydration.
I use Himalayan salt which has balanced minerals in it. I throw about 1/4 tsp per glass or just enough so it doesn't taste too salty.
Sometimes I've accidentally put in too much, but it doesn't make me thirsty as you would think.
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Did you ask your physician about this when your tests came back normal.........what might be medically causing this or emotionally?
I do not have an answer for you but perhaps some other member may.