This is a REAL fermented grape soda made with actual grapes and real ingredients!
Simmer grapes and sugar in water for about 20-30 minutes.
Cool to room temperature and strain out the grapes
Transfer what’s now essentially grape juice to some 2 and 1 quart glass ball jars or demijohn.
Add whey and let it ferment for at least 3 days. Swish the soda around once a day to prevent mold from forming on the surface. Look for visible signs of fermentation via a slight fizziness.
Transfer grape soda to soda bottles.
Keep the soda bottles at room temperature and check every day. The carbonation will increase rapidly! That’s what the soda bottles are designed to do. The soda is often ready in one days, two days max. Open the bottles every day to let some of the gasses escape. Do it over the sink to be on the safe side. You’ll probably get a nice pop and fizz the first time you do it. After a few days, you can move the bottles to your refrigerator where the fermentation will dramatically slow down.
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