You can drink much water to keep your eyes hydrated. It might be work. Moreover, there are some other ways such as ice gel pack, heat gel pack,antihistamine,humidifier. Allergies/illness/injury/strain/lacking of sleep or infections/ foreign particles can cause red/bloodshot eyes. After trying out some home remedy, if your symptoms persist, obtain medical attention from your doctor. They will give you some professional idea. Visine drops contain vasoconstrictors, which shrink the blood vessels on the eye to make them less visible.