It's a one-time thing. You just need to pay him once. And no, they have their own supplies.
In fact...
They get restocked every time you get healed at a temple. I took a look at the healing script and it replaces the henchman's potions and whatnots. They only get.... Three, I believe, but I could be wrong. Any more and they have to come out of your own pocket (In the heat of the moment, that is. You try and give a henchman a potion, they won't save it, they'll use it immediately)
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