1 / 12 Take small sips of cold water throughout the day. Work in some variety with clear fluids like ginger ale, tea, and sports drinks. Giving your body all the liquid it needs boosts your appetite. It can also ease side effects like constipation, dry mouth, mouth sores, nausea, diarrhea, and fatigue. But be careful with sugar. Sweet drinks make your nausea or diarrhea worse. If that happens, stick with water. 2 / 12 Get up and move as much as you can. Walk, swim, or take a yoga class.