Question: how many litres of water a day is safe?
Answer: A total daily intake of around 2.7 liters (91 ounces) for women and 3.7 liters (125 ounces) for men can meet most adults' needs (19). Depending on the other foods and beverages you consume, you may not need to drink 3 liters (100 ounces) of water per day to meet your fluid requirements.