Prepare water kefir as you usually would. If you are completely new to water kefir, you can find instructions here. Otherwise, you want water kefir that has already fermented for 48hrs.
If using ginger juice and lemon juice, skip to step 5.
Blend 2 inches of ginger with 4oz of water. Strain and blend with an additional 4oz of water to extract as much of the ginger as you can.
Juice the 2 large lemons
In a pitcher, mix ginger juice, the juice of 2 lemons, 1/4 tsp molasses and 1 tbsp sugar. Mix well and taste. It should have great ginger flavor and a hint of lemon as is. If the ginger is not strong enough, use some of the water kefir liquid to blend another inch of ginger. Proceed to the next step once your ginger ale tastes delicious!
Bottle in flip-top jars or a 1 quart mason jar.
Allow to ferment for approximately 2 days. Shake as often as you can remember to. When fermentation is complete, you will see bubbles climbing up to the top, and when you open the jar it will hiss at you.
Move to refrigerator for several hours, or serve over ice. Enjoy!