[Silound]

Technically, placing a shotglass of "drinking" water in the humidor is the same process as distillation. The water will evaporate into the air and be absorbed by the wood. The major downside is any impurities that impart flavor (chlorination, water softening, fluoridation, etc) could all potentially leave a lingering flavor.

If you have some trouble getting any suitable water for your humidor (I bet it uses a LOT in that dry environment too!), you can make your own.

If you have the time and a place to put it and store it, you can make a simple solar still device using a bowl, some plastic wrap, a small object to use as a weight, and some relatively clean water.

Place the empty glass in the bowl, pour some water around it in the bowl about halfway up the side of the glass. Be sure NOT to get any in the glass! Now cover the bowl as airtight as you can get it (hello duct tape!) with the plastic, and set it in the sun. Place the small weight in the center of the plastic over the cup, just enough to make the plastic sag slightly! Metal bowls or black ceramic bowls work best, but any bowl will work if it will absorb heat from the sun.

As the water in the bowl evaporates, it condenses on the plastic, and eventually runs down the plastic (since it is sagging slightly) into the glass. Presto, distilled water! The setup works most efficiently with a shallow layer of already relatively clean water in a larger bowl, because there is more heat absorption with the larger bowl and a larger surface area to condense on for a small amount of water.

Over the course of a hot day, you can use this method to distill up to about two cups of water per 24 hours with an optimum setup. The dirtier and more impure your source water, the less you can distill out per day.