1/3 cupactive ginger bug (check this post on how to make a ginger bug)
Instructions
Heat the water, ginger, salt and sugar until a simmer and the sugar has dissolved. Leave to cool to room temperature and let the ginger infuse in the water.
Add in the juice of the lemon or lime.
Add in the active ginger bug liquid.
Strain the liquid and pour into bottles and seal air tight.
Check for carbonation after 2-3 days, especially in glass bottles to avoid them bursting.
Once it is carbonated, store the bottles in the fridge to slow down further carbonation.