I read that you should drink 1 liter of water per day per 20 kg of body weight. So, for example at 80 kg 4 liters daily! The thirst comes with time by itself. I only drink tap water. Take 1 teaspoon of sea salt plus 3 grams of vitamin C / ascorbic acid dissolved in 2 liters of water every morning. Sea salt consists of 84 elements including many trace elements! Vitamin C can not be produced by humans, it must be fed daily, just like the sea salt. You will be amazed in a short time (after 4-5 days) about the positive effect on body and psyche, for me it was like that!