Water Adjustments to a finished beer

So I am in the process of obtaining a water report from ward. My water at home tastes bad and I will be correcting it shortly. However I did brew a blonde last fall that has a really terrible taste because of the water. Its still in a keg. I was wondering if and when I get my water report if I can figure out what is causing the off flavor if I could repair the beer. I don't imagine its possible once the beer is done but just thought I would ask.

 

I would try to cover the off flavors with fruit, like raspberries. or dry hops.
I doubt much else could work. But I have no clue actually! (edit: sorry, didn't realize this was posted in the brew science thread).

 

What is the terrible taste? If you can provide a description of the off flavor/bad taste, we could help more.

 

There is little chance that you can fix a water induced problem in the finished beer. In fact there isn't a single water induced problem that I can think of for which there is a solution except perhaps adding some table salt or calcium chloride to improve body and sweetness or some calcium or sodium sulfate to enhance hops bitterness.

 

This was the answer I thought I would get. I appreciate it.

 

If it tastes bad dump it. The key is to find out why it is bad. It may not be water based - could be infections, astringency, bad recipe.