In a spray bottle of distilled water - add 1/2 capful of lavender oil and 1/2 capful of tea tree oil (you can add more essential oils if you can stand the intensity of the smell - I'm pretty immune and like the smell, so I make all my essential oil 'products' strong
).
Spray over bedding and carpet areas around beds. Spray in linen closets and clothes closets.
You can even wash any clothing and bedding by adding tea tree oil to your wash.
Tea tree oil gets rid of bed bugs and kills dust mites. It also wards off other bugs. Lavender also wards off bugs and mosquitos.