Testing for Pectin
There is a test that uses rubbing alcohol to provide a rough indication of the amount of pectin in the fruit. Mix 1 teaspoon of cooked, cooled crushed fruit with 1 tablespoon of rubbing alcohol. Use a closed container and shake gently. Juices from fruit that is high in pectin will form a solid gelatinous lump. If the fruit is low in pectin, it will form only small rubbery particles. Those with an average pectin content will form a few pieces of the jelly-like substance.
It ought to be needless to say, that just as you should never put a cup of very hot coffee in your lap while driving a car, you should not eat the test mixture (that with the rubbing alcohol in it) as rubbing alcohol is a poison.
Make your own pectin?
Cookbooks from 50-100 years ago often have recipes for extracting pectin from apples for use in other jams and jellies. You may have noticed that old jam recipes often include some lemon peel for the pectin content, and jelly recipes from the pre-SureJell and Certo era are usually essentially apple jelly with other fruit for flavor. Aside from strawberries and blackberries, few other fruits have enough pectin to make self-jelling preserves.