Weight the water phase ingredients into a heat safe container.
In another heat safe container, weight your oil phase ingredients.
Heat both in a double boiler until the oil phase ingredients are melted. I will normally heat both the water and the oil phase at the same time, in a pan with a silicone mat on the bottom. This way, the two phases are heated to about the same temperature.
After the oil phase is melted, pour both the water and the oil phase ingredients into a mixing container.
Mix well with the stick blender. You will want to keep mixing in bursts, until the temperature drops to 120°F.
Add your fragrance oil and preservative. Then stick blend to combine.
Place the conditioner into containers. This can be done by placing the mixture into a plastic baggie and cutting one corner. Then you can easily pipe it into the container.