so you mean just buy pre sterilized, decap them, and recap them.
Yeah that's one way to do it.
Or I can sterilize my own vials, put the stopper on, inject the oil through the stopper and then cap it, the injection for filling can be done directly from a syringe filter (that takes time tho) or I can filter everything into a media bottle using syringe filters and then aspire with a syringe and fill the vial with the content of the syringe through the stopper as you said and then cap it.
I don't really wanna start using bottle top filter, it's a waste of money for me. Max I'll brew in one go is 100ml. Bottle top filter come in no less than 150ml and it's 20$ each, I can filter a lot more gear with 20$ of syringe filters.
For big quantity it gets a lot cheaper the bottle top, 500ml are 30$ each.