I have a habit of putting my empty potion bottles back in my trunk, certain crystal vials are not exactly cheap. The next day, vials I knew for bloody certain were empty, had refilled with the exact same potion that were in them.
Potion ingredients refill or resupply as I use them, as long as I put them back in my trunk. Doesn't matter if it's a day later or a week later. I put them back, the next day it's replenished.