Originally Posted by Mojzis
I use tap water. I haven't done any sort of tests on it either. Sadly I don't know whats in it. What should I do to check the water?
Usually that "band aid" taste is from chlorine or chloramines in the brewing water. Chlorine can be boiled off, by preboiling your water, but chloramines can not. The treatment for either is to use one campden tablet (crushed) stirred into 20 gallons of brewing water (or 1/2 tablet in 10 gallons). You can do that the night before you brew if it's convenient.
To get a water test, a sample sent to Ward Lab is great. I think I paid about $16 for the tests I needed for brewing.