How do you know if a drink has caffeine in it?

For example, I wanted to try Crystal Light Peach Ice Tea. Doe sit have caffeine--it doesn't seem like real tea. Is Crystal Light a good drink option?

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.

You must be logged in to post an answer. Click here to log in.