"we blended together six previously inaccessible winemaking ingredients to make each magical brewsy bag."
There are some gems on the Brewsy website. They do list the 6 magic ingredients:
"Amazing" yeast
Organic Micronutrients (sounds like Go-Ferm + Fermaid O)
Bentonite
Pectic Enzyme
KBicarb (this is an odd one)
Malolactic culture
So I don't object to the ingredients, just the breathless, exaggerated, over-hyped nature of the marketing. Just me, but these seem like pretty normal wine making ingredients. Looks like about $3 worth or less. Notably absent is any sulfite. So you should make this and drink it quick. What's odd to me about this is the Malolactic culture. That fermentation takes awhile and so including it wine you're supposed to drink in 5 days is odd, especially if you don't know if you juice even contains any Malic acid.