It is difficult to determine what THE best water is, because which bottled water you choose remains a question of taste, style and price. Some factors are regulated.
Spring water contains less than 500 mg of minerals per litre or 500 ppm (parts per million), as indicated on the label. You can drink it regularly, even in large quantities, especially if you choose a brand with a low mineral content. Spring water is generally flat but some, such as Perrier, are carbonated. Check the label: it will reveal the source (provenance) of the water. Mineral water contains high levels of minerals such as calcium and sodium. Its total mineral content is greater than 500 ppm. Some brands even contain more than 14,000 ppm.
Mineral water is usually carbonated. Healthy people can drink mineral water without any problems, as long as they don’t overindulge. Drinking it regularly in large quantities can have an adverse effect on the kidneys and can lead to the formation of kidney stones. This is why children, the elderly, or those suffering from hypertension, kidney or heart problems should consult a doctor or nutritionist before partaking.
The best idea would be to simply opt for spring water. Look for the chemical abbreviation “Na” to find out the sodium (salt) content of bottled water. You can choose water that is low in sodium if that is what you are looking for.