Many water sources are loaded with minerals and require softening (removal of trace elements) not hardening ( fortifying with more). On small scales some add other salts, fluoride,electrolytes,pedialyte for kids, UN/UNICEF and ngos provide Rehydration Salts https://www.rehydrate.org/index.html emergency relief and refugee camps meant to be combined with pure water https://www.rehydrate.org/index.html https://www.unicef.org/supply/reports/oral-rehydration-salts-ors-and-zinc-market-update even shitty Dasani has magnesium sulfate, potassium chloride, and salt added. Anything beyond would be more a Tea or broth beverage blurs lines on calling it water
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