A traditional recipe for homemade ginger ale that is lightly fermented with cultured starter which adds beneficial probiotics and enzymes to the brew.
Mix all ingredients together thoroughly in a half gallon glass jar. Be sure to leave 1 inch at the top else the soda will get moldy instead of ferment. Affix a secure lid.
Leave at room temperature on the counter to culture for 2-3 days and then refrigerate. Homemade ginger ale is mildly fizzy. You can then mix with sparkling mineral water post-fermentation to add even more fizz if desired.
Alternatively, you can bottle the homemade soda and leave on the counter for an additional 1-2 days before refrigerating to produce a very fizzy beverage. Be sure to let the bottled soda get very cold before opening. Opening in the sink is a good idea.
If the finished homemade ginger ale is not sweet enough for your taste (usually necessary for those coming off a soda habit), add a pinch of optional stevia or stir in a small amount of raw honey.