1In a jar, mix ginger, water, and sugar. Keep it in the fridge with a kitchen towel and a loose lid.
2When you want to make soda, take it out, top it up with some room temperature water and a tablespoon of sugar. Let it sit for a few hours or overnight.
3Add some of the ginger bug liquid to a bottle and then add some juice.
4Close it up and let it carbonate in a pressure safe bottle. Refrigerate before opening.