I have brewed four One Gallon Kits (Cream Ale, Brick Warmer Red, Irish Red Ale and Whitehouse Honey Port) and have had the same issue with each kit. All have little to no carbonation after bottling. I have tried to follow the directions and have been using the Fizzy Drops but with the same result. Flavor of the finish beer is good but very little carbonation. I’m not sure where I’m going wrong. I know it’s likely a yeast problem but I do not seem to have this problem with the five gallon kits I’ve brewed so far. Those have had Good carbonation after a week of bottle conditioning. So I’m not quite sure where I’m going wrong. I would write it off to a bad batch if it was only one time but four batches is a trend.
Those drops are meant for a 12 oz bottle filled with a bottling wand top the top of the bottle. The wand, once removed, displaces the perfect head space for proper carbonation. How are you filling you bottles?
After your yeast has had 1 to 3 weeks to carbonate the bottles, I suggest you put the bottles in the fridge for 3 days before opening. This amount of time gives the beer enough time to absorb the CO2. If you just pop them open without a chance to cold absorb you typically end up with a short lived spritzy kind of carbonation.