1. Ginger Tea. Ginger tea is easy to make. Measure 1/4 teaspoon of ground ginger into a heat proof mug or glass and pour 1 cup of boiling water over it. Cover with a saucer and let sit until cool enough to drink before straining. (I line a fine mesh strainer with a coffee filter to do so.) Sweeten with honey or sugar as desired.
Vicks VapoRub is considered absolutely unsafe for children under 2. Consumption of small amounts of one of the ingredients (camphor) can be fatal for children, and getting Vicks in your eye (hard to avoid in little ones) can cause eye damage. So, I would highly recommend against using it in young children.
Anything oily or greasy added to a humidifier creates buildup that will affect the mechanisms that propel the steam or cold vapor. Vicks VapoRub -- a cream or ointment -- contains an oily petroleum derivative that can shorten the life of your humidifier and is flammable when heated. The product warnings issued by Procter & Gamble say: When using this product, do not heat, microwave, add to hot water or any container where heating water..