Here's a translation into American English:

Here's a piece of life knowledge that isn't scientifically proven: our human health heavily depends on water, air, and sunlight. So, as long as the water we drink is good, the air quality is good, and we get some sunlight regularly, our bodies are unlikely to encounter major problems.
Although I am currently in the city, I mainly drink well water, which I fetch myself by driving to get. If I don't have time to fetch water occasionally, I buy mineral water (not purified water). Good-tasting water has a slightly sweet flavor.
Our bodies are 70% water, and the tap water we usually drink is quite hard. Long-term consumption can subtly and negatively affect our health. Drinking too much tap water can make the body less flexible and more prone to stiffness. That’s probably why there are so many health issues nowadays. I feel that water quality is likely a major factor. The air quality now is somewhat better than before.