Humidifier can help with the nose and throat symptoms caused by flu. Breathing in moist air has its benefits. For one, the moist hair can help to clear up your nasal passages. This will also help clear up any congestion that you may have. The moist air is also very soothing for sore or dry throat.
If you do have a humidifier you should definitely use it. If you do not have a humidifier, there are other ways to create similar effect. You can take several hot showers a day and inhale the steam while you are in them. If you don’t want to take a shower, let hot water run for a few minutes and sit in the bathroom to get the benefits of the steam from the hot shower.