If you are looking for a more natural antiperspirant then try this recipe.
To make 1 pint/570ml
8 floz/225ml purified water
8 floz/225ml rubbing alcohol
2 tablespoons alum
3 tablespoons rose water
In a small bowl, mix the water, alcohol, alum and rose water together. To use, transfer the mixture into a plastic spray bottle, and use as you would any commercial antiperspirant.