Today only, Amazon’s running a big sale on small drinks. Specifically, Forto coffee shots (think five hour energy, but for coffee people), Stur water enhancers, and, uh, Jelly Belly drink mix bottles. At the very least, try some Forto! There are a bunch of flavors, they’re just over $1 per bottle with this sale, and an additional 5% clippable coupon on the page makes them even cheaper.
Note: Some of the Forto shots have 200mg of caffeine, and others have 100mg. Choose accordingly.