I just found these on Aliexpress, there are some on Amazon too. You fill these with cotton (if they don't have cotten already), put a few drops of essential oils in there and can take it with you wherever you go. Very handy for travel. These might be handy for filling with Vicks Vaporub too for people with respiratory issues from asthma, cold or flu.
https://www.aliexpress.com/item/32908249531.html?spm=a2g0o.productlist.0.0.63dc3e26F9z6D1&algo_pvid=3d41e41d-ddd2-41a5-be85-3b810143dcc9&algo_expid=3d41e41d-ddd2-41a5-be85-3b810143dcc9-0&btsid=4e18b79a-0b97-4233-bd23-4c6e49692dbf&ws_ab_test=searchweb0_0,searchweb201602_9,searchweb201603_52
https://www.aliexpress.com/item/32908249531.html?spm=a2g0o.productlist.0.0.63dc3e26F9z6D1&algo_pvid=3d41e41d-ddd2-41a5-be85-3b810143dcc9&algo_expid=3d41e41d-ddd2-41a5-be85-3b810143dcc9-0&btsid=4e18b79a-0b97-4233-bd23-4c6e49692dbf&ws_ab_test=searchweb0_0,searchweb201602_9,searchweb201603_52