The purpose of toning is to close the pores that open up when you cleanse your skin and seal it with a protective layer. Thereafter, when the moisturizer is applied, it does not clog the pores. The market is flooded with toners in every price range. But do note, not all of them are beneficial to the skin in the long run. Here is a time tested recipe for a toner that works on most skin types. Mix equal parts of white vinegar and water and store it in a bottle. Use this daily after cleansing. For acne prone skin, you can use Apple Cider Vinegar though this tends to leave an unpleasant smell for a few minutes. So make sure you use the toner a few minutes before you step out.
For those with dry skin, rose water is an excellent toner. Another natural toner is fresh aloevera juice. It also acts as a layer of anti-bacterial lotion protecting the skin naturally. It also helps heal scars from pimples and acne. However, make sure these ingredients are fresh to ensure maximum effectiveness. Store any home-made toner in a clean bottle and make sure you prepare just enough to last you a week at a time.