 Dr. Aaron Campbell, a physician with St. Alphonsus in Boise, said, We all need to be drinking more water. Staying hydrated is the most important thing, but sunscreen, he said, is a close second. CBS2 reports, according to Campbell, hydration is not just about liquid intake, but about nutrition as a whole. Campbell also said, You want to mostly drink water, not sports drinks, because you can also get electrolytes from food.