PepPod is a light, sugar-free tablet bursting with 81 milligrams of caffeine and a taste similar to those little eye-opening cans. Just drop the tablet in a bottle and watch it dissolve in seconds into a fizzy, tasty drink. It also contains often-touted energy drink ingredients guarana and taurine. The price is $15 for 10 pods. Get it at www.peppod.com.