I always taste me beer prior to bottling, usually after taking gravity readings. At first I thought I was just paranoid when I noticed my beer (Holiday Red Ale) had a very tinny, almost fizzy taste to it. I thought nothing much of it and went ahead and bottled it anyways. So fast forward a week (yes, too soon but I like to try one every seven days after bottling to see how it develops), and I noticed the taste is still there. Is this normal? If my brew is indeed infected, it's obvious that it happened during fermenation..... which leads me to my second question. I usually put vodka in my airlocks instead of water. This time however I used some tequila because I figured it would work as good to kill any bacteria that might find it's way into the airlock. It wasn't until later I realized that I occasionally drink directly from that bottle. Could this have been a possible source for contamination?