Are you saying both your fridge-filtered water and your five-gallon jugs are tasting metallic? I could see one or the other occuring, but, if both are, you're the common denominator. Are there dietary deficiencies (minerals, vitamins) that can leave someone with a metallic taste in their mouth?

Try a search (ddg or brave, etc) on "metallic taste in mouth". Below is one decent article.

https://www.newmouth.com/oral-health/metal-taste-in-mouth/

Are you saying both your fridge-filtered water and your five-gallon jugs are tasting metallic? I could see one or the other occuring, but, if both are, you're the common denominator. Are there dietary deficiencies (minerals, vitamins) that can leave someone with a metallic taste in their mouth?