Do you want a solid bar of soap at the end, or a liquid or mushy soap?
Is your tea tree 100% Tea Tree Essential Oil? If they are calling it "tea tree oil" it is probably a tiny amount of tea tree essential oil in a carrier oil such as sweet almond.
If you want a solid bar, I would recommend grating the soap very fine, then adding a small amount of water - say 1/2 - 1 teaspoon - stir it well, then let the shreds sit overnight. Since it is such a small quantity, I think rebatching in an oven bag or in a boiling bag might be best.
https://www.brambleberry.com/Rebatching-Techniques.aspx
Then after your soap is liquid-y, put it in a bowl, add your tea tree, stir well and put in a mold.
Enter your email address to join: