Yes! It's not proven to cause any damage to your body.
Yes.
It is generally not recommended that you put essential oils directly into any household appliance. Even properly diluted, some essential oils--lavender and eucalyptus, for example--have solvent properties and will damage plastic and other surfaces.
You
All soap is lye soap. You cannot create anything that is soap without lye. If you are having a problem with head lice I would either suggest the shampoo they sell at the store for it or a shampoo that contains tea tree essential oil. ( Please do not put tea tree essential oil undiluted on your skin. It can cause irritation and burning if not properly diluted.) There are many online websites where you can buy shampoo that contains tea tree essential oil but I still strongly suggest you use the shampoo from the store.
Get rid of all the water and soap in the humidifier and rinse it out and put in clean water.
Red bug bites are fairly easy to treat. Calamine lotion put over the bug bite, or essential oils such as lavender or tea tree oil can help the bites.
Peppermint is not recommended as a bath oil. The peppermint essential oil can cause stinging, or dermatitis. When peppermint essential oil is included in mixtures intended for topical use it is drastically diluted with an inert carrier oil.
I believe you may be referring to "essential oil" which is extracted from the sap, bark, leaves or flowers of whatever tree or plant is used. For example, when preparing frankincense, the bark is stripped from the tree and the sap is burnt as it exudes from the bark. In this form it is the essence of the frankincense tree and is very intense. The sap or resin may be put through a further process of liquification so it is rendered suitable for use in home oil burners.
Essential oils should be floated (just a drop or two) onto water in a burner or you could get a an flammable solution or unpleasant smell!
try to put tee tree oil on it
Usually, water.. because it puts humidity into the air (humidifier-humidity.. get it..?) or you might put water mixed in with some sort of medicine that helps improve breathing. but that's only if you need the humidifier to help with a sickness.
only a couple of drops
Choose a carrier oil and essential oils to put in your body oils. It is usually better to use more than five different types of essential oils. Add one drop of essential oil per ounce of carrier oil and then shake up the bottle to mix the oils.