Drinking a lot of water doesn't make your skin moisturized.

I was forcing myself to drink a lot of water to keep my skin hydrated, but apparently that isn't the case.

If your body is already sufficiently hydrated, drinking more water won't make your skin moist!

Ultimately, they say that applying moisturizer properly is the most important thing.

Below is a part of the article.

When the body is dehydrated, blood volume decreases, and blood is not supplied smoothly to various parts of the body, including the skin. Consequently, the lipid layer, which acts as the skin's protective barrier, is not properly maintained, causing moisture to escape from the skin. In such cases, replenishing fluids by drinking water improves skin condition.
However, it is difficult to say that the more water you drink, the more your skin stays hydrated. This is especially true for people who already have sufficient hydration levels. The water you drink is not delivered exclusively to the skin.