Here is what happens when you drink water on an empty stomach

plastic components into the water, which can disrupt hormones.

After drinking the four glasses of water:

Do not eat or drink anything for the next 45 minutes.
Eat breakfast after 45 minutes.
Do not eat or drink anything for two hours following each meal.
If you cannot manage four glasses of water, that is perfectly fine. Start with one glass and gradually work your way up.