[scottteng]

Have you tasted it may already have enough alcohol to kill the yeast. Wine yeasts usually have more alcohol tolerance. more sugar the better if you suspect the juice use less with more water sugar and real fruit

[Zuben Elgenubi]

Have you tasted it may already have enough alcohol to kill the yeast

This would be my number 2, after preservatives in the Kroger brand as number 1.

[Rides_A_Red_Horse]

You’re better off testing with a hydrometer. Measure before and after fermenting and finishing.

Your local brewery supply should have them for sale.