CURING POR 15

Im guessing you have a space heater blowing scorched hot air? Like Dana67 sez, A cheap humidifier would be a pot of water (maybe on top of an oil sealed plug in portable radiator or stove).
Keep the water level up, as the heat atomizes the moisture into the air, the water level drops.
Also a cheapo plastic hygrometer will show you the moisture content in the air, anything between 30 and 50 is DRY!