iron and sulfur compounds in tap water, or even some more “neutral” ones that are even in bottled water (like carbonates and magnesium), can have a really revolting taste to people who are sensitive to them

I have a friend who is so sensitive to sulfur that she had to rinse her drinking cups with filtered water before using them, just to remove the traces left by washing with tap water from the area we lived in

don’t let anyone tell you you’re crazy or overreacting. also, give distilled water a try. no, it’s not bad for you like people say–your highly acidic stomach is perfectly capable of handling the osmotic shift when drinking distilled.