While outside, add lye to the water and allow to cool slightly.
Pour lye water into the crockpot and blend with a stick blender until light trace (it starts to thicken light pudding). Be careful to not splash yourself with the soap, since the soap may be shallow in the crockpot.
Cover and seal with plastic wrap and allow to gel. The soap will churn and change color, becoming more translucent.
Once fully at gel phase, add the alcohol and glycerin and stir with a stick blender again. It may be chunky at first, but it will become smooth eventually. Again, be careful of splashes.
Leave uncovered and allow to sit around 2 hours.
While alcohol and glycerin are working, melt sugar in water over the stove on medium heat. Remove from heat.
After alcohol and glycerin have been working for around 2 hours, add sugar water and stir. Let air bubbles work their way out while the mixture is still hot.
Scoop pieces off of the top of the soap.
If you'd like to test for transparency, take a spoonful out and place in a glass in the freezer. It'll set up quickly and you'll be able to tell if it's going to be clear or not. If not, let it cook uncovered in the crockpot for longer.
Add essential oil and stir.
Pour into mold. Air bubbles will continue to work out of the soap for the next week.
Unmold after hard enough to do so. This sometimes takes 2-3 days.