Divide your ingredients into 2 quart size mason jars, or one larger mason jar. Add mint leaves last, 2 in each jar
Cover with purified water and shake it up to mix the honey, mint, and berries together
Seal jar with lid let it sit on the counter for 2-7 days. I let it sit for 5 days
When you start to see bubbles (usually after 1 day) release the lid and let a little air out so it won't get over carbonated. If you don't see any bubbles, just keep it sealed until the 2nd day
When your fruit looks cooked and your brew is bubbly, open lid and strain out the fruit. Place liquid in a seal proof bottle. This is your kvass
Leave the fruit kvass liquid sealed in an airtight bottle on the counter for another 1-3 days to build up more carbonation, or just feel free to keep in fridge. Add more mint leaves and/or berries before serving, if desired. Keep it in the fridge and enjoy!