Performing more often is an excellent goal, but plunging in headfirst can be dangerous and taxing. If you mean to keep this resolution, be smart about it.
Coffee has a diuretic effect and causes our bodies to actually lose water when having more than 500 mg at a time, but also note that not all caffeinated beverages are the same. Depending on the brand, sourcing, and cup size, a regular cup of coffee can range anywhere from having 58-281 mg of caffeine! You should also take into consideration how fresh a cup of coffee is, since water evaporation causes a higher caffeine concentration: The longer a pot of coffee or tea has been left out, the stronger it gets. (The more you know!)