https://rewinterpark.com/blog/altitude-sickness-in-colorado/#:~:text=Headaches%2C%20fatigue%2C%20and%20nausea%20are,activities%20like%20skiing%20or%20hiking.
Water/water bottle, ibuprofen or other pain reliever for headaches, lip balm and moisturizer as its significantly more dry in CO than IA!