From a mom in one of my ASD groups.
1 part essential oil with 10-20 parts carrier oil or alcohol.
For a smaller batch, start with:
10-25 drops (total) essential oils
2 TBS carrier oil or alcohol
The essential oils that work well against mosquitoes are:
Safe carrier oils and alcohols include:
any other cooking oil
Mix it together. Use a solid colored spray bottle. You can rub or spray it onto skin or clothing. *Some oils can stain clothing.
This has to be reapplied after about an hour or after swimming or exercise.
Store in a dark bottle away from sunlight or heat.