Management Record: Water Drinking Rules...

Cosmetics are just umbrellas; real moisture comes through the blood vessels.
We often expect expensive creams to penetrate deep into the skin, but in reality, cosmetics' primary function is to act as an umbrella, preventing moisture from escaping from the surface. The dermis, the true foundation of skin, lies too deep for cosmetics to reach.

The only highway that can bring water here is the blood vessels.

Drinking a glass of water is like applying a stream of water directly to the dry, dry dermis. Stop superficially applying makeup and quench your skin's thirst with 1.5 liters of water a day.

The elasticity that rises from within is determined not by what you apply, but by what you drink.
Drinking a small amount frequently, such as a paper cupful every hour, rather than all at once, results in the highest cell absorption rate.

Try going through the management records.

After drinking coffee + 1.5 times: Caffeine drinks such as coffee or green tea have a diuretic effect and actually dehydrate you.