I use 100% coconut oil soap with no water discount. I usually shred it within couple hours of making it and measure it into 6 ounce zip lock bags. Then for each 6 ounces I use 12 ounces distilled water, 1 cup borax, 1 cup washing soda and 1/4 cup preservative. I usually double the batch. I heat the water to dissolve the shredded soap and add the borax slowly as the water cools or it will cause a lot of crystals. Which don't really hurt anything but some people don't like. You can scent it or not depending on preference.