Continuing off flavors!

[pdxal]

All the factors (water, yeast, ingredients, sanitizer, etc.) changed with same result probably means it is a process issue.
Try brewing with another homebrewer and see if you are doing something wrong.
-Don't buy bottles, drink good beers and re use the bottles.

 

[grathan]

Arrowhead mineral analysis suggests low calcium and high bicarbonate. Might want to try a different bottled water one time.