To make it, mix together:
2-3 tablespoons coconut oil (warm up to a liquid if necessary by standing in hot water or out in the sun)
1/8 cup baking soda (bicarbonate of soda)1/8 cup arrowroot powder or cornflour (cornstarch)
Allow to set in a container that allows you to press the solid bar out. A travel soap canister, like mine above, or shallow plastic dish would work well. When set, rub on as required.
At the moment we are having temperatures in the low to mid 20Cs and the deodorant stays in a solid bar, like soap, that is easy to apply. It kind of melts on to your skin from your body heat. I imagine that in the summer it will be more liquid so I'll have to see how it goes then. There is no residue left on clothes, although it's probably a good idea to be careful of the oil on some fabrics.