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How much alcohol to preserve grenadine?

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First time poster here, thank you for reading:  I've recently become a convert to making homemade grenadine, with pomegranate juice and sugar.  It's tasty, but a bit time consuming and I'd like to add some vodka as a preservative.  Ideally, I'll add the minimum required to retard/eliminate spoilage.  Can anyone tell me how much vodka would be needed to preserve 1 cupful of grenadine?  It starts out as 2 cups pomegranate juice and 1/2 cup sugar, then reduces by about a half.  So it's pretty sugary.  Just not enough (I suspect) to keep indefinitely. 

Thank you!!!! 

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