OK i am in emergency panic mode right now. I made a 5 gallon batch of a dry stout but the problem is the gallon water jugs i used ended up only being 3 liters not the full gallon. The beer is already in secondary fermentation and is just about ready to bottle before i realized I am over a full gallon of water short. Is it too late to add the extra gallon or can i still add it and be safe?