I used to drink overnight stored copper water sometimes, now my toddler is 2 and we are both super healthy. Don't stress too much over small things, regular RO water is also absolutely fine.
When I was dealing with thyroid, I had to be super regular with blood checks and general care. Best check with your doctor once about any special water regimes to be safe.
Mera dhyan hamesha sugar aur liquid intake par rehta tha. Copper vessel me stored paani peena is okay, but limit check me rakho aur cleanliness maintain karo.
It is normal to doubt every single glass of water you drink right now! Copper water stored overnight is generally fine in moderation, but if it makes you anxious, just drink normal filtered water.