Some bakers prefer to take their chances when creating a new sourdough starter. I prefer to use this easier and less risky method.
Glass jar, 1 pint or larger – I prefer an “old fashioned” glass top canning jar
1 cup flour – any type, or any combination of wheat, spelt, or rye – at least half should be wheat
1 cup water – chlorine free – if you are using treated city water, let it sit out overnight to allow the chlorine to escape
1 organically grown grape – unwashed
Cheesecloth
Combine the flour and water in the jar. Drop the grape in, and cover the top of the jar with the cheesecloth. Secure the cloth with a rubber band to keep flying critters out. Keep the jar in a warm place.
Visit your starter often, and stir it several times a day.
After a few days, you should see some bubbles forming in the mixture. At this time, remove the grape and feed your starter a tablespoon of flour. Remove the cheesecloth and use the glass lid to cover the starter.
You will now need to feed your starter every day. About one tablespoon of flour per day is sufficient. Add more water (filtered or otherwise chlorine free) as needed to maintain a “pancake batter” consistency.
Within a week, you should be able to use some of the starter. Whenever you use it, make sure you have a little left in the jar and add some flour and water and give it a vigorous stir.
Notes:
If you are not able to feed your starter daily, you can keep it in the refrigerator and feed it once a week. However, it needs to be at room temperature and fed for a couple of days prior to using it.
I like to give my starter a clean jar every week. Sometimes the dried batter on the sides of the jar begins to smell bad.
Now you are ready for some sourdough baking adventures!

What is the purpose of the grape in the starter?
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There is naturally occurring yeast on the outside of the grape, which will become the sourdough culture. There are probably many fruits which could be used. I know some people use an organically grown plum.
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Interesting! I like your method because there is no discard, which I find very wasteful.
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