Use evaporative humidifiers (just disks with myriads of small notches for water to cling on and a fan): https://us.smartmiglobal.com/pages/smartmi-evaporative-humid...
You don't have to buy one either. A suspended wet towel with a fan blowing on it will work very well. If you want to get fancy, have the last inch or two of the towel sitting in a tray of water.
Most kids did't read the manual? I would rtfm for every game I got my hands on during the car ride home from toysrus or blockbuster. If Mom had several errands to run, I may rtfm a dozen times before I finally got home with the game.