Science says that women should drink 2 liters of water per day, and men drink 2.5 liters per day. However, all bodies are different, with their own functions and requirements.
The healthy amount of fluids might be different for one person than it is for another – for instance, athletes who exercise and sweat a lot will need to replenish their fluids faster than people who live a sedentary lifestyle, who would require less water.
Listen to your body’s needs. Make sure you’re drinking 2 liters minimum, and drink more if and when you’re thirsty.