For tea, buy a glass pot with the screen insert in the top. Or toss some leaves in a cup of very hot water for about ten minutes or whatever suits you. They say (and I believe it's true) the first brew has most of the caffeine so if you don't want the caffeine rush, pour off most of the first brew then just add hot water and drink it again and again and again.
Or, using a water bottle, toss some tea into very hot water. Let it sit for ten to fifteen minutes and drink. Refill it before it's empty. You can refill it with the same tea many times depending on your taste.
If you're like me (I hope not) don't drink it at night as it keeps me up until 6 a.m. or later.
For what it's worth, I like oolong tea. I can't recommend any brands as my Chinese friends usually buy it for me, but I avoid the cheapest teas. Buy something in the middle and you're probably good.