While water is the only solution for staying hydrated from the inside out (supplemented by Gatorade as needed, should you find yourself suffering from a temporary condition that can only be cured by Glacier Freeze and a bacon, egg, and cheese), it is wrong to portray it as the only route to dewy, gallon-a-day skin. The best hydrating serums will act like a packet of Hydrant on a superficial level, giving you the extra assist you need to attain that much-desired, hardly-achieved glassy skin — best paired with a glass straw, of course.