Lemonade just happens to be our favorite way to flavor water kefir, but we have tried many of these flavor options and most all were delicious.
UPDATE: My new favorite flavoring method is to toss half a frozen sliced peach into the jar before fermenting! The result tastes like a peach Italian soda!
You can also double ferment water kefir (just like you would kombucha) in these Grolsh Style flip-top bottles.