I was thinking capsules purchased, sitting in a bottle. Home done they could be swallowed before the EO eats up the capsule. I prefer the steam inhalation method, I use a variety of EOs for that purpose, and make my own blend, about 1/2 eucalyptus, topping off with fir, pine, spruce, tea tree, basil, and thyme. I may try adding a bit of oregano too.
Ingestinon of EOs does need to be done very cautiously. Can’t undo...
All those are good anti-microbials and will clean you out! Oregano is the best I know of to fight off viral symptom onset. Again, IT IS HARSH! Go slowwww. And if your lips are chapped, you might want to put some wax or Chap Stik on before you begin. It can be uncomfortable on dry lips.
Side note. Chicken farms that switched to no antibiotics are using oregano in the chicken feed with even better results. There doesn't seem to be a necessity to increase dosage either.