Especially right when you wake up. Aim for 1 liter within the first hour of being awake. This will help you wake up, jump start your metabolism and assist with healthy bowel movements.

Drinking 4 liters of water per day is a reasonable goal. Aim for more if you are in a hot climate, are really active or you enjoy alcohol regularly.

Protip:

Buy lemons from the local market and squeeze them into your water. I recommend 1-2 small lemons per day, best with warm water in the morning. Warm lemon water helps with digestion, it is good for your skin and alkalizes your body.