Make sure you drink lots of water each day. Sports drinks, sodas, coffee and even juices do not count toward this. Drinks other than water are filled with sugar and additives that may do more to dehydrate you than hydrate you. Drink more water than anything else, and if you have a beverage like alcohol that is dehydrating, make sure to drink twice as much water as it, to balance out.
True yams are very different from sweet potatoes, but are worth seeking out, and are frequently found in ethnic markets. It's got lots of Vitamin C and B6, in addition to lots of minerals and fiber. They are quite popular baked in their skins or mashed, where their natural sweetness and bright color makes them popular with kids.
To maintain optimum nutrition in your diet it is important to get a wide variety of colors on your plate. The different colors really are different nutrients your body needs. Try to get at least three different colors into every meal. Try greens like kale, grapes, and cucumbers; reds like tomatoes, strawberries, and chilis; oranges like sweet potatoes, fall squashes, and carrots; light colors like cauliflower, potatoes, turnips, and whole grains; as well as other bright colors you see in blueberries, mangoes, avocados, peppers, and pineapple. Eating a diversity of colors will keep your nutrition balanced.