From a medical perspective, safe, clean drinking water is the most important factor, regardless of cap colour.

Colors of Water Bottle Caps Have Hidden Meanings? According to some social media posts, black, blue, green and white caps indicate the type of water you're drinking. Jack Izzo Published June 5, 2024 ...

Five-year-old Claire Franzman was hard at work Sunday, strategically arranging bright green bottle caps with her tiny fingers on the floor of a meeting room at Bettendorf Public Library.