I recently brewed a Schneider Aventus clone and the end result was a flat beer. I missed a step in the instructions to add a fresh dose of yeast a few days before bottling so I'm assuming that this is the result of sluggish yeast. I still have a gallon in secondary that I was aging on oak chips so I ordered a more yeast to add to that.
My question is can I pop the caps of the flat beers and add a small amount of yeast to each one and recap them? Is this a viable route to take or are the flat beers destined for the drain?
Edit: If I remember correctly I primed with 1/4 cup DME for a one gallon batch and 3/4 cup DME for a 3 gallon batch. I bottle conditioned/carbonated for a month in my basement which is a steady 68 degrees.