Now have a think about what you really want or really need in your bathroom. What space you have in your cupboard and if you think you may need some extra storage in the bathroom.
To make more room in the cupboard, you can put toilet paper (at least a couple of rolls) in a basket next to the toilet. These days there are some great basket options, they now make very attractive baskets in resin, that are very easy to clean. You may still end up having to store most of your toilet paper in the another closet, but at least you have some in the bathroom.
If you don't have space in the bathroom, why not keep one or two spare small towels in the cupboard and the rest can go in the another cupboard, as well as the pace cloth's.This will free up a lot more space!
If you have a cupboard with draws in the bathroom, work out what you use most often and pop those things in the draws ie Makeup, etc. Then put all the bulk items in the back of the cupboard, but remember not to put them that far back that its a lot of work to get them out. Organize the rest as best suits you and your families needs.
One things I have to suggest, is to keep all medicines up high!
Means if your friends that do have children turn up, you won't have to worry if they go in the bathroom! You never can be to careful! If you don't have a high wall cupboard in the bathroom, you could put them in a plastic container and up in the wardrobe or in the Linen cupboard. What ever works well for you.
There are some great plastic containers out there these days, expensive through to cheap and everything in between and they can be great as won't go moldy or be damaged by the mildew that bathrooms can grow.
Make sure that you open the window every day, even if its just for an hour. It will dry the bathroom out and keep it fresh.