Hi, I made my first batch of grenadine a few months ago and will never go back. It was very simple: 1 cup juice, 1/4th cup sugar, reduced to 1/2cup, and bottle. No lemon, no rose water, no vanilla. Planning to try those soon.
But I am someone who will have a week of drinking XYZ and then a week or two of drinking something else, and I'd like to KNOW that my grenadine will be refrigerator stable for at least a few months. Can anyone tell me how much vodka or Everclear I should add to be certain that I'm going to kill lingering bacteria? I know it will be sweet, and I will probably make it even sweeter using some of these above recipes. But I like knowing that the alcohol is going to kill anything that might try to grow. If I have 8oz of liquid, will 1oz be enough?
Ideally I'd like to know the biological or chemical ratio, something that will apply for non-grenadine liquids as well. Bitters, extracts, etc.
I also posted this elsewhere, apologies, before finding this thread -- seems like this will be a good place to find experts. :-)
Thanks so much for any and all help!!!