The first thing to do is stick a hygrometer in there to see what the relative humidity percentage is right now. Then you can determine if you need to put a tray of water in there or a soaked rag in a tray or whatever.

Note that R.H. changes with air temperature - for us here in Canada it gets relatively low in the winter due to the dry, cold, air, and significantly higher in the winter. If it's at least above 30%, you shouldn't see any problem.
I've got a unit from Oregon Scientific that includes a remote thermometer/hygrometer - picked it up on Amazon a few years ago for $30. Great unit.

Where do you live? Unless you're in some zero humidity hell-hole like Colorado you probably don't need to worry that much.
I used a digital hygrometer and a small glass bowl with distilled water added once every 5-6 weeks (approx 5 ounces of water) get humidity fairly contstant for 5 weeks on my 166 bottle cellat.
IT is a game of trial and error, start with smaller amounts of water, se how long humidity stays in your ideal zone and adjust water amount accordingyly. If you put too much water in you will see lalels starting to peel off bottles.
I found keeping water as far awaty from blower on top of unit also helped.
Also I was told keeping the temp outside of the wine cellar a constant helps with the stability of humidity and temp within the cellar and also prevents wine cellar motor from additional workload.
From what I've seen, most wine coolers reduce the humidity to around 50%, give or take a bit, regardless of the external ambient humidity.

The methods noted here, as well as others (e.g. - putting wet sponges on the bottle necks) will temporarily raise humidity.

my only thought was the use of some of my humidor humidifier materials.

i use beads that regulate RH to 65%. they pull in moisture when it's over, and release if it's under. i think i'd have to have a rotating supply though because the beads would become saturated within a few days, and it would take maybe a day to remove moisture from beads once i take them out of the cooler.

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