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She tried aerating by "splashing" but after inoculating hasn't seen signs of fermentation. How much hydrogen peroxide would you guess?

Looks like about 4 gal, but that includes skins (she has a few grape vines but was only able to harvest that much after bees/wasps). I think she's only hoping to make a bottle or so. How would I measure the ppm?

My mother-in-law accidentally added 1.5 tsp of metabisulfite to her grape juice before inoculating with yeast. Can the grape juice be salvaged? Or is it ruined? Thanks, -Paul