In May I bottled my 2013 Riesling made from Riesling juice. Prior
to bottling I filtered the wine, and added simple syrup, potassium
sorbate, and kmeta, all in the correct quantities. It tasted very
good at bottling time, however, now after a few months has passed,
it has become drier and has a slightly bitter finish. What caused
this change, and is there anything I can do now to correct it,...