In convenience stores and vending machines, you might be wise to prioritize water over other more flavorful and less healthy beverages if you're fatigued.
The Dallas Wellness Center explains that a person with chronic fatigue syndrome may experience dehydration. Think of it like this: A well-oiled machine will run more smoothly and probably last longer than one that isn't. In order to function properly, your body needs a good balance of fluids, and if that balance is out, it can lead to fatigue and strain. Dehydration may also cause headaches and brain fog in patients with chronic fatigue syndrome.
If you don't think you can solve your fatigue overnight, you should gradually increase your water intake over a few weeks. You may want to keep a journal and keep track of how much water you are drinking to make sure you don't overdo it. If you have other conditions like kidney issues, you may need to add more water.