Do you ever have those days at work when you feel like you need a little pick me up? You aren't really hungry, so you don't need a snack, and you aren't craving anything in particular (with me, it's usually uber-dark chocolate or something salty). But the afternoon (or morning, even) is starting to drag.
What can you do? You can't go for a run...unless your job title has something to do with the word "athlete." You don't want to pay five bucks for fancy coffee...because you are trying desperately to stick to a budget. You want something healthy, but water just won't cut it.
My vote? A hot cup of green tea.
Green tea is delightful...you can buy a cheap or a fancy version at your local grocery store, and you'll get the same benefits either way. One particular benefit is that green tea contains some caffeine, but not nearly as much as the same amount of joe. This allows you to enjoy the feeling of more energy without worrying if you'll pay for it later trying for hours to fall asleep.
Plus, if you slice up some fresh lemon and maybe drizzle in a bit of honey, it tastes pretty darn delicious.