Travel CPAP question

I have a HDI Z2 Standard Travel CPAP that I got to use for the second time during the holidays. The Z2 worked great, but it doesn’t have a humidifier. Now I have used my AirSense 10 with the humidifier turned off before, and now the Z2 with the heat / moisture exchanger gizmo, and while I don’t end up with dry cracked lips with the Z2 like I do with the Airsense 10 with humidification off, I do wake up with a dry mouth.

A little background though.

I live where it is VERY humid most of the time, and we travelled to the desert, that may have something to do with it…

So my question is, is there something I can do with the Z2’s heat / moisture exchanger to make it, well, moister?