What is Reddit's opinion of GT's Kombucha, Original 16 Fl Oz?

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This is what I personally used, it's GTs synergy rather than classic.GTs Synergy on Amazon

Make sure you're using unflavoured booch to start your scoby. Any added flavouring/fruit/juice will make it mold.

Here's what I use to make my SCOBY: 2 quarts water, 3/4 cups sugar, 3 tbsp of green tea, a bottle of unflavoured kombucha (this brand - pretty easy to find here in Ottawa, Canada, and a well-known brand). I covered it with a clean hand towel and secured it with a rubberband. Let it sit in the corner of my kitchen away from windows/direct sunlight. My apartment isn't air conditioned but I do my best keep it cool, so I'd guess the temp was around 25 degrees Celsius. Mine was ready to use in about 2 weeks. I posted pics from the process here.

Hopefully this helps! Don't give up, you'll get it!