1. Group like things together -- store all cosmetics in a washable cosmetics bag or plastic bin (subdivide cosmetics into categories if you have lots), all skin-care products on the same shelf in your medicine cabinet, all shampoos in one spot under the sink.
2. Get rid of things regularly. Cosmetics have a finite shelf life, as do skin-care products and medications. Every year, take an inventory, and throw out those items that are expired, you no longer use, or are damaged. There is some concern that flushing expired medications down the toilet can adversely affect the water supply. Instead, ask if your pharmacy has a drug take-back program. If not, throw medicines into the trash; secure them in a garbage bag and make sure it is out of the reach of children or animals who might get into trash bins.
3. Keep small items in containers. Hair accessories, bottles of nail polish, brushes and combs will all be easily accessible in see-through plastic bins, with neat, easy-to-read labels.