DIY reed diffuser. I have tried making my own using alcohol as well as oil. The alcohol version evaporates at a greater rate but diffuses faster. The oil version was more noticeable in warmer weather, I do find EO do not last as long unless you choose a blend with a eo as a base. Something with staying power. For instance, citrus, while glorious, will not last as long as, say, patchouli.