How to Make Vinegar At Home Keep all your old cheap two litre vinegar bottles. Divide a new bottle into the two empty bottles and fill to the top with fresh rainwater (no tapwater - chlorine is a no no!) and leave in a warm place (but not in direct sunlight) for two to three days. You will then have full-strength vinegar ready to use! It will weaken eventually - so only try from the save bottle three or four times before...
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