For oil you can't beat just buying a real cheap rebuildable dripping atomizer and building a high surface coil. Just dab a little on there, kind of heat it barely so it'll soak into the coil and cover the metal, then blast away. Theres dedicated tanks and cartridges like I was a big fan of the omicron cartridges but just using a dedicated rda is way better, way better mixture of air to vape so you don't sear your lungs and throat