just use one or do something this like: https://sites.google.com/site/goatherder/bulkpriming
I use to use 1 cup dextrose to 2 cups of boiled water and then use a syringe to get 10ml of the solution into about 300ml of beer, this would equate to about 15 ml solution into 450ml of beer.
It can be suggested that carb drops can overcarb beer so 1 carb drop into a 450ml bottle would robably be fine but adding 2 drops may make a bottle bomb.
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