Originally Posted by gnubierguy
The 8 lbs of DME sounds like a mistake. Other than huge ABV what effect will this have on the brew? also as this still fomenting would adding water to replace the lost liquid improve the brew or would you just let it ride and bottle when fermentation is done?
You can add water(boiled to kill germs, then cooled to room temp) to the fermenter to replace the volume lost to blow off. 99% of the time I would NOT suggest this method, since you are basically diluting the beer with the added water. In your case, since you seem to have made beer-concentrate, adding a gallon or so to the fermenter might be a plausible course of action.
If you choose to add water, do not add too much (probably 1 to 1.5 gallons at the most), and do it as soon as possible, while the beer is still fermenting. This may help lower the ABV enough to give the yeast at least a chance of finishing fermentation before they all pass out from alcohol poisoning! This would also be an opportune time to add a second dose of yeast.
If you do choose to leave it as-is, then I suggest letting it primary for one month. Check the gravity make sure that it gets stable. I bet this brew stops somewhere around 1.025 to 1.030 because it started so dang high! Once you bottle them, stick them in the back of the closet and forget about them until next Winter. You will have beer by this Christmas, but it is very likely that it will taste like Jet Fuel if you do not let it age a very long time.