There are several threads that address this issue (preventing rust being one of them). Unless you have many razors or do not shave often, I would not worry about rust. I like the Royall lime but it does not come in a clear bottle... People have tried to make their own aftershave (Bay rum) but it is not necessarily the easiest thing to do. The ingredients are hard to come by and the extraction method can be a bit complicated with household equipment only. If you are interested in citrusy aftershaves, these may be easier to make.

Al raz.