You can skip the water in this recipe, if desired. The soap may not pump so well (you'll need to squirt it in your hands), but it will probably last longer than the water-based face wash. If you do this, the castile may feel too drying for you, so you may want to reduce the castile soap amount.
When you introduce water into a product without a preservative you always run the risk of introducing bacteria, so use water-based products quickly.
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