Water tastes weird and coper pipe looks corroded / affected
Get a water test kit (from a laboratory - &quot;home kit test strips&quot; are next to useless IME) carefully follow the directions for taking a sample, send it to the laboratory, read the results.
There's really no way to infer what your water problems might be over the internet.
Many state (or similar local area) governments have relatively low cost water testing laboratories. They are there for the safety of your drinking water, not to sell you anything. There are also independent laboratories.