It’s easy to do an air humidifier for only one dollar, check the video I found on youtube. It explains how to cheaply and easily do an air humidifier.
If you’re looking for a more professional answer check Air O Swiss humidifiers were you’ll find the best range of air humidifiers in the world.
There are no more excuses not to have your air humidified
wait, since when do electric kettles cost less than a dollar?