Okay, I was putting my mead into secondary and was using sorbate/sulphite. I was finally just topping it up in its secondary container...pouring in some honey water and I noticed the mead was fizzing a bit. I just assumed it was some yeast / co2 reacting to the sugar so carried on. After I topped it up I looked at the bottle that I had used. Low and behold....TONIC WATER! This stuff is horrid...it has sweeteners / quinine in it and tastes foul. Anyhoo...will my mead ever recover from this? Will the harsh quinine taste ever disappear? It was around 450ml of it in a 4.5 litre (1 imperial gallon) carboy.