Prepare Your Base: Start with 4 cups of fruit juice or brewed tea and mix in the sugar. (If using a fruit juice that already contains sugar, you can skip this step or only add a few tablespoons of sugar) Make sure the tea is cooled to room temperature. Any hot drink can kill the ginger bug and your drink will not carbonate.
Add the Ginger Bug: Pour in 1/2 - 2/3 cup of your active ginger bug. Stir well to combine. Make sure to strain the ginger bug first. You can add the strained ginger back into the jar.
Bottle the Soda: Use glass swing-top bottles for best results. Leave about an inch or two of headspace to accommodate carbonation.
Ferment: Seal tightly and let ferment at room temperature for 2-4 days, up to 7 days. Check daily and burp the bottle (open it to release the pressure). You do not want to open it too often because this interferes with the fermentation process. Once a day or ever two days works best.
Taste and Store: Once fizzy and slightly tangy, transfer to the refrigerator to slow fermentation. Enjoy it chilled!