posted 6 years ago
Hubs & I make water kefir, and various fermented foods regularly, and have played around with mead & cider - including mulled cider. When you put sugar of any kind, including fruit sugars and dairy/lactose, in any non-oil liquid, it will sour and ferment. This doesn't mean it's unsafe to drink, but that the flavor and alcohol content are going to change. What you use, in what proportions, at what temperatures, and your own personal taste are what will combine and typically determine whether it is palatable, or not. Eventually, it will begin turning to vinegar. Some taste better than others, at this stage, but even then, you're not looking at toxicity - you're looking at vinegar. It just is the natural course - the bacterial circle of life. Refrigeration will slow it down some, but not for long. This is why wine goes 'off', why beer gets skunky, etc. If you attempt to freeze it - depending on which stage it is at, when you put it in, it might explode. In fact, the container you choose to try this in should be heavy software, or plastic with some give - or make a habit of burping it, or leave the lid loose or cover with cloth, or invest in a carboy, and just accept that you won't be able to give it to the kids, or anyone sensitive to alcohol. I've lost track of how many bottles and jars we've had explode, because it was forgotten, for 1 extra day (including those heavy duty ones, meant for canning). In the case of the water kefir, that can happen in as little as the first 36 hours of fermenting, after sealing.
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