What to Put in Vicks Humidifier

What can I add to my humidifier water?

Add White Vinegar: Fill your humidifier with water, distilled or otherwise, and also add a cup of white vinegar to the tank. This will help prevent any mold from growing.

Is it OK to put Vicks in humidifier?

It is a common cold and decongestant remedy that is safe when used appropriately but should not be added to a humidifier. But the company cautions against using the ointment in warm-mist humidifiers and, instead, makes Vicks VapoSteam, a product that contains no petrolatum, to be used in a vaporizer.