i drink all mistakes. you learn pretty quick that way. if they dont appear to improve with age, they still inevitably get ingested.
right now, i have my first batch of mead that i mistakenly used philadelphia city water for (completely forgot about the ****ton of chloramine they add to make it the some of the "cleanest" city waters in the country. needless to say, it tastes dull and plasticy. its difficult to even gulp down quickly let alone sipping it. the plastic gets worse every time. to reinforce the "dont use chlorinated water - spring water is really cheap" part, i am drinking every bottle. slowly, but surely.
on the bright side, i have had terrible beer go from bad to worse to fantastic over the course of a year so that was a good surprise.