How Much Water Should I Drink During Exercise?

How do I know if I am dehydrated? Dark urine, urine with strong odor, not having to urinate, fast heart rate, muscles stay excessively sore. How much should I urinate daily? At least 4x/day (~8-10 fl oz each time). Which electrolytes do I lose during exercise? Sodium, Chloride, Potassium. How should I replace these electrolytes? …