To keep your nasal passages moist, you can:
-->Use a humidifier or vaporizer.
-->Take long showers or very carefully breathe in steam from a pot on the stove.
-->Drink lots of fluids, which will thin out your mucus and may help prevent your sinuses from getting blocked up.
-->Use a nasal saline spray – simple unmedicated salt water – to help prevent your nasal passages from drying out.

i hope it is useful to you  :)