Today, I found out that my 16-year-old son bought a huge amount of grape juice, because he thought he could store it under his bed and wait for it to turn to wine. FML
Baking powder 18? What on earth will that do? You need yeast to start fermentation. Yeast occurs naturally around us all the time which is why some wines are 'wild ferment' meaning no yeast was added and just the yeast that was naturally sitting on the skin caused the ferment . Chances are he would get something from it (especially if he has exposed it to air) but unless monitored properly the ferment will probably become stuck and not contain much alcohol. Either way it will taste awful!
Grape juice into wine isn't that impressive. When he's able to turn water into wine, then I'll be impressed. I'll be presenting five gallon buckets of water to him.
Yeast are not the only bacteria capable of fermentation there is no guarantee it would form the correct type of alcohol though. Even human cells can perform fermentation in a lack of oxygen it's what forms lactic acid.
not all of it. we made apple cider using a mixture of apple juice. brown sugar and spices and there was not a drop of alcohol. it was an american recipe, it gets served to kids at halloween and other autumn/winter holidays.
You have to watch it with apples. It can also ferment into vinegar from what I've read. That is why most people who home brew wine don't recommend using them.