go ahead and leave it sealed just remove it from teh refer. I had a hermeticaly sealed bottle of grape juice for two years at room tempratures (Philippine room temps are warmer) later when I opened it it taste like wine not juice it had fermented and its alcohol rate was very low. it was still drinkable but it didn't taste like grape juice any more it taste like red wine. so see you can argue all you want I know I am right by virtue of experience.
by the way most grapes carry their own yeast on their skin. it cannot be fully removed so even small mounts get into the juice. I made wine both organic and commercial in my BC days.
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