This might freak a few people out, but it’s real, it’s super convenient and it’s a really great way to break the energy drink habit. Kaffn8 Liquid Caffeine is available in 240 ml squeeze bottles that allow you to pre-measure the ideal amount of caffeine and add it to drinks or food. It’s the brainchild of Paul Koerner, a pharmacist who wanted a way to quickly get his caffeine fix without any fuss. Liquid caffeine is extremely bitter, so it needs to be added to other foods. I like to add a couple of squeezes of Kaffn8 to a mixture of ginger beer and seltzer. It’s a great way to get the benefits of an energy drink without paying $4 a can. Cost: as little as 10 cents a serving.