I use almost the same mix, I keep it in a tall wide mouth canning jar in my basement which is around 60 degrees. The canning jar has one of those 2 piece lids, I put a piece of ziplock bag between the 2 to help give a better seal.Give it a good shaking a few times a week. I haven't had a problem with it skimming over yet and I've had this batch for around a year
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