In point of fact, in much of the world, like the Third World and the T*rd World areas, water is usually not safe to drink.
Only in developed nations where pollution can be controlled, and water purified, does man have safe water.
In most of America, do NOT drink directly from surface water. Parasites and diseases are common in surface waters.
Tap water, on the other hand is treated and IS safe. Technology, and Western societies - science based, linear logic, patriarchal culture - gotta love ‘em.
The sanitation engineer is civilization’s unsung hero. It occurs to me I know of many famous people who contributed to “progress” but I don’t know the name of the men who created the water/sewerage system for the City of London/New York. But their achievement was as important as that of the men who built the Panama Canal.