hello buddy love

I have never seen a set ratio of water to vinegar....

I have always used vinegar myself to lower the ph of water... it woks great.... usually add about 1 teaspoon or less to a 5 gallon bucket of 8.0 ph water to get it down between 5.0 and 6.0...

I would start with a few drops and then stir your water... and then check your ph...

keep adding drops of water until you get the desired ph..

you are love