Frequent thirst is claimed to be a symptom of diabetes and/or pre-diabetes conditions, although there are other possible causes. Low thyroid function can cause, or contribute to, the urge for more liquids. (Your doctor may be able to provide a thyroid supplement if that's appropriate.)

The serious diabetics of my acquaintance agree that sipping cold liquids is more effective than gulping large quantities of fluids. LiK is constntly accompanied by her "go-cup" that she fills with ICE (and hammers it down to get as much in as she can) and then adds a bit of tea. Mostly what she constantly sips is just melted - but still cold - ice water, although she's an "ice-sucker" when crushed ice or the last of the melting cubes is available.

If you find that you're one of those for whom this works, a spoonful of crushed ice (sucked and melted in the mouth - NOT CHEWED) may be as effective as a glass full of something, if used frequently and regularly. (Small ice crushers were a popular accessory for all the coctail parties people thought they would have, but never did, back in the 50s. They probably can still be found, although I haven't looked recently.)

Both CPAP and Oxygen Concentrator machines do have a tendency to dry out your airways, and normal heating systems may drastically reduce room humidity. The breathing machines can be equipped with "humidifiers" to provide some moisture in the air they pump at you, but most of these are so poorly designed that they deliver "drips and spurts" of droplets that may give the impression someone is trying to drown you.

It's hard to find an effective humidifier to raise the humidity of the room air in your immediate area. "Personal inhalators" that claim to provide "cold steam" that you can sniff in are widely advertised and might help, although I haven't found one that does much for me. "Sniffing" the steam off the top of a hot beverage works about as well as most, for me; but you have to keep the cup warm.

John