There are four easy steps to refilling a vape cartridge. The first step is to buy vape juice from a certified company. You can find CBD vape juice on the Sky Wellness website. Next, you’ll need to remove the mouthpiece from the battery. After the mouthpiece is removed, you’ll want to grab the vape juice and a syringe. Fill the syringe up with the juice and add the juice to the empty cartridge.