Sorry I missed this - the correct amount of preservative is 50/50 mix (though you can also use Colloidal Silver at a smaller ratio but you cannot regrigerate it if you do so, but rather keep it in a dark container and storage spot). You might also note that I have changed my recommendation to regular pasteurized and filtered apple cider vinegar because it is a better preservative. There is a chance your product might go moldy with that small amount of Braggs. Vodka appears to be the best option.