“¼ to ½ teaspoons of salt (around 1.5 to 3 grams) per liter of water” for physically active individuals and less for sedentary lifestyles.💖

https://www.health.com/does-adding-salt-to-water-help-hydration-7550827

“For example, an athlete who just ran 1 hour may have lost between 1,300 to 5,500 mg of salt in their sweat,” she said. “They could benefit from adding ½ to 1 tsp of salt into their recovery beverage, or focus on incorporating a meal that contains salty foods post-workout.”

However, a commonly suggested guideline for those engaged in endurance activities is to add about ¼ to ½ teaspoons of salt (around 1.5 to 3 grams) per liter of water, Crumble Smith said.4 This is equivalent to about 500 to 1,000 mg of sodium, which is about the amount lost in one liter of sweat during intense physical activity.”