Mix a few essential oils and put them inside the bottle with a nozzle when my hair needs extra TLC, but I switch between French Argan oil and coconut oil for my regular hot oil treatment.
If you are using an applicator, then I recommend boiling the water first and then putting your applicator into the hot water. While your oil is heating, separate your hair into sections so it's easier to apply the treatment. Dampen your hair a little bit before you start with your hot oil treatment. This is something I have done for years and was passed down from my mother to me.
Back to hot oil treatment, once you are done, let it sit for half an hour. Keep it for an hour if your hair is super dry. Rinse out the treatment, and you will feel the instant result; manageable curls, no tangles, and no-hassle!
These are the hair treatments for dry hair that I swear by. These two treatments have been used in my family for generations. The ingredients have changed, but the results are instant.