Soda that’s good for you? Yes, please! The key to making this gut-healthy drink is to start with a ginger bug. Similar in concept to a sourdough starter, a ginger bug is a fermented mixture of fresh ginger, evaporated cane juice and water, and it’s what gives homemade sodas a refreshing natural fizziness. The time it takes for the soda to fully ferment depends on the temperature in your home – if it’s warmer, 2 days should do it, but you might need up to 10 days if your home is on the cooler side.