this has been a PSA from a very grumpy herbalist
The only time you dilute with water is as directed for diffusing, and then make sure it’s distilled water, especially if you have allergies or asthma.
As far as carrier oils are concerned, I usually use fractionated coconut oil for rollerball application. Jojoba is what I’d go with if I was putting it on my face.
PLEASE NOTE: If you get essential oils in your eyes or on sensitive bits (don’t be my buddy, wash your hands after applying), DO NOT use water to flush the area!!! USE OIL. I have extra virgin olive oil in excess at home for this purpose.