When cleaning my Aura Integrated CPAP machine system today, I immersed the humidifier reservoir base in water. (Even left it soaking in the vinegar/water solution for about 4 hours.)  I can hear a tiny bit of water inside of it.  Have I ruined the machine?     

I've not seen your model, however I believe they are all protected from water damage by some electrical safety.regulation.
(You should put the quote in your signature line.)



If thou sleep, thou shalt not fear: thou shalt rest, and thy sleep shall be sweet.


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my best guess would be that if you can totally dry the unit before turning it on, you might luck out.  I think the unit isn't ruined until it is switched on with water in it.  Can you tilt, open any cover? dry with a blow dryer?  even if I had to wait a week or more, I wouldn't use it unti I knew it was dry. I also would not sleep with it, until I had been able to leave it on during the daytime for several hours with good results.
 Have you called the mfg for their recommendations, check your owners manual for their number.