Another good thing to pack. Is a thermos filled with crushed ice, if your water bottle gets warm and its gross to drink, you can add crushed ice and have a nice refreshing cold drink.
Ladies! Make sure to pack your feminine hygiene products! Just in case- especially for people who spot and for people who are about to get it. Also just in case another needs one. Also, first aid! I bring bandaids, a gauze pad, ect.