Thats why all pipes in houses use to be copper today you get microplastic pipes.....

Copper is an anti-biological. For example: copper oxide is used in anti-fungal treatment for trees, but is known to kill beneficial bacteria in the soil.

Copper is listed as the main active ingredient in “anti-fouling” paint used on the bottom of ocean going boats to keep barnacles and plants from taking hold.

Based on that information I would believe that copper cups are at least somewhat anti-bacterial.

However, things that kill bad bacteria also kill good bacteria. Could this affect the gut biome?

I don’t worry about anti-bacterial soaps, cups, etc. Your immune system needs a little exercise to stay healthy. Just like the rest of our body does. Don’t waste your money.

I can dispel most of the other claims off the top of my head also, but this note is already long. Let me know if you want to learn more.

what if it's not water but a Moscow Mule