Add water to large pot.

Slice lemons in half and squeeze lemon juice into pot of water, and throw lemon rinds in as well.

Add grated ginger and sugar to the pot.

Heat to a boil, and boil for 15 minutes.

Strain into a large bowl or pitcher and cool until temperature is 80 or less. If the temperature is too high, the heat will kill the bacteria in your ginger bug starter.

Once the liquid is cooled, strain 1 cup of ginger bug liquid into a cup and then pour into your ginger/sugar/liquid mixture. Stir.

Using a funnel, pour the liquid into the flip top bottles. Close the bottles and store in a cool, dark place for 2-4 days to build up carbonation. How fast carbonation builds up will depend on the temperature of your home. Check daily to see how carbonated the soda has become, and taste the soda if desired. When the soda is very fizzy, it's ready to drink. At this point you need to store bottles in the refrigerator to avoid over-fermenting. Enjoy!