My favorite thing to have is all different types of teas to drink! (healthyhelperblog.com)
While various types of tea almost always have less caffeine than your average coffee, they were also proven in studies to reduce cortisol levels a lot more than a placebo. (fitnessandpower.com)
Here's an article about caffeine and here's an article about what types of tea to use. (kombuchakamp.com)