Dehydration makes your skin look dull, dry, and accentuates wrinkles and fine lines. When you drink water on an empty stomach, it reaches your skin cells faster because there's no food competing for absorption. Adequate morning hydration improves blood flow to the skin, helps flush out pore-clogging toxins, and increases skin elasticity. Many people notice clearer, more radiant skin within 2-3 weeks of this habit.