« on: April 08, 2014, 06:56:13 AM »
You may get more sour in a few months. Anyway, an eyedropper in a glass should work. You'll need to figure out how many drops are in a ml. Next figure out if what 1 drop/glass is equivalent scaled up to the amount of beer you want to sour. If it works out to be a reasonable increment of lactic acid (5-10 ml would be great) then proceed with your experiment. If it turns out to be unreasonable (let's say 100 ml) then use a bigger glass.