When your water kefir grains start to multiply beyond what you can make.
This Kombucha reminds me of the classic English Ribena with a slight lemon twist.
White lady peaches are my favourite for this bubbly drink, but any peach variety will still give great flavour.
Vegetable broth is very versatile. It is not only great for sipping on cold days, but adds wonderful flavour to rice, quinoa, soups and stews.
See Celery Root Crumble for another way to use vegetable broth.