Let's examine a few things...
EVERY skin type/condition requires hydration - in simpler terms: water. (It also needs lipids/fats, enzymes, and other substances to function properly - that's another article for another time.)
Your skin cannot function, heal, excrete toxins and waste, circulate properly, or perform the necessary house-keeping processes if your body and skin surfaces are dehydrated/lacking water. This is called DEHYDRATION.
DRY skin is generally layers upon layers of dead, flaky, built-up, flat/non-light reflecting, keratinized ('calloused'), irritated, sensitivity-prone skin. Usually, the lipid barrier/pH is messed up and unbalanced.
You can have both, or one or the other. Either way, you skin's lipid barrier and pH needs adjusting from inside and out.
My clients always hear this analogy at their first visit: I constantly remind them that they need to picture their dried-up cellulose kitchen sponge sitting on the counter. It is crispy, rough, and hard. You can rub as much Crisco, butter, olive oil or fat on it as you want, and it still will NOT become SOFT. When you wet it, it becomes soft and pliable. BUT, it dries up again. If you wet that sponge first, and then covered it in something emollient (fats), or wrapped it in plastic wrap, what happens? It stays moist longer. A very simplified analogy, but this is how you skin works, too. Keep licking your lips, and they dehydrate and crack; keep an emollient on top and it keeps them soft and supple. The same applies to your skin. Wash it, the water evaporates, and it usually feels tight. You need to do TWO things: add a water-retaining hydrator AND an emollient over-top to HOLD IN the water. You keep it cleansed, treated, hydrated, and moisturized. See the picture now?
First, you need a natural hydrator. The substance I recommend is hyaluronic acid/sodium hyaluronate. It holds 1000 times it weight molecularly in water. I carry the finest, purest, top-of-the-line HA in my skincare spa, and it can be purchased very reasonably with any service. Not all of them are the same, and they can be heavily preserved. How does one drop sound? Yes, that is all you need, then you proceed with your serums and moisturizers.
Afraid of OIL!!!!??? All moisturizers and lotions start out with fats/oils/triglycerides/and-or waxes in them. Those substances are hydrogenated, whipped, bleached, and deodorized, have acrylics added to them, and are heavily preserved because the chemical structure has be changed to an UNNATURAL substance, than can go rancid very quickly. Most of them become very alkaline and have to undergo further chemical treatments to reduce this alkalinity (pH). All-in Ones are not the solution. Oh, and they are generally loaded with parabens, which are very bad for you...
Your skin is naturally acidic - so are natural oils. Why use the chemical concoctions when you can use something very natural and affordable, unpreserved, and close to your skin's natural pH? Manufacturers have been trying to incorporate water and fats together in one product, with minimum results. That process is called emulsification - mixing fats with water, usually using chemicals like polysorbates (bad for you) to hold them together.
I recommend you always apply 1-3 drops of a natural skin oil; or a pea-sized drop of an all natural creamy serum packed with essential oils and vitamins and natural healing substances, over-top of HA for superior results. I carry many types of natural and organic serums suitable for most all skin types.