I find it interesting that most of the comments are about physical products. The 'best design' is often something that's so frictionless and easy to use that it's invisible in day-to-day use. Everyday infrastructure like steps are something that's noticeable when they're off (e.g. spaced too far apart, or too steep); most are designed well. It's easy to find things that are designed poorly. But much less tangible to…
Agreed. It's real tempting to answer, "indoor plumbing". It's really nice to flip a lever and get clean, safe water. It's real good not to need to stroll to the outhouse, too.
Normally we just filter the stuff between the tap and cup. And as a kid, we had to boil and store it, and just learned to tolerate the metallic/dirt taste at times. This was when soda peaked.