Add a cup of warm water to a bowl and add the Sucanat (or raw sugar) to dissolve. Add lemon juice and make sure the liquid is at room temp
Add the Kefir Soda Starter packet OR kefir whey to your juice mixture and stir till dissolved. Fill the rest of the bottle with water leaving an inch of room at the top.
Allow it to ferment for 3-5 days or until bubbly and fizzy. If your home is 75°F or warmer it will take usually 3-4 days. Colder homes can take 5 days to a week or longer but you'll need to check it by popping the top and see if it's getting fizzy. It will start to bubble out the top if it does.
When it's done, you can pour it into a glass and enjoy it right away or place it in the fridge. It will continue to ferment in the fridge, so burp it daily and consume it within 1-2 weeks for the most benefits and the best flavor.