New source of caffeine needed pronto!

Giving up soda has become a huge challenge for me. I give in to the temptation every time. Yes, today I had another evil Diet Dr. Pepper, but then at lunch I had some Pepsi. I woke up this morning with a super bad headache and I know it was because I hadn't had caffeine in two days. I need to find an alternative source for my caffeine addiction. I have decided on tea. I used to drink it all the time, now I am just going to start drinking it all the time again!