- 2 tablespoons starch of your choice (arrowroot powder, corn starch, potato starch, tapioca...)
- 3 tablespoons organic virgin coconut oil, softened (available at natural foods stores)
In a small bowl, combine the baking soda and starch. Add the coconut oil, and stir it in until smooth and creamy. Transfer to a flexible food container -- this can be a small plastic tub, or a couple of muffin liners -- and refrigerate for a few hours, until hard.
(If you have an empty deodorant tub with a little wheel thing that pushes the stick up like a push-up ice pop, I'm fairly sure you could refill it with the coconut mixture. I couldn't bring myself to buy one only to throw out the deodorant stick, though, so I haven't tried it.)
Once hardened, pop the stone (or stones, if you've made several) out of the container(s), and rub it on like an ordinary deodorant. Keep in an airtight container in the fridge to preserve that rub-on texture, or at room temperature to apply like a lotion.
This amount will last one person 2-3 months.