If you've found something that works well for you and that you love, it is usually way less expensive to keep buying it than to go through the trial and error of duplication. Especially for items with many ingredients with unknown quantities. If you're hankering to lose money and and are flexible on things like fragrance, texture, or color, you can look up all of the ingredients. Figure out how much money it would be for you to buy them, if there are any special considerations of any of them such as toxic, combustible, or caustic, or if special equipment is required. Then decide if you want to spend the time and money on duplication.