I went off caffeine a few years ago and never looked back. But plenty of other people still carry that monkey on their back. The irritability, low energy, and splitting headaches of caffeine withdrawal make this a prime stimulant to stock. Black tea, coffee packed for a long shelf life, Excedrin tablets, and 5-Hour ENERGY shots are fine sources of this craveable compound. Make sure you have enough. To figure out the right amount, allow at least a few cups of tea or coffee per day, or one energy shot per day. The Excedrin will help, too, providing both caffeine and an analgesic for the caffeine withdrawal headaches.