I haven't done the juice quest on Classic yet, so I am not certain what's going on here, but I was with a friend the other day who was doing it, and when I took her to see Max Hansen in Payon, she tried, and then said "oh, I guess I need empty potion bottles" (in spite of what the wiki has to say about it).
I took her to Alberta to buy some empty potion bottles, then we went back to Payon and she was successful in getting her juice.
I guess I'll go do the quest in order to confirm for myself...
EDIT: Confirmed.
I did the quest, went to the juice NPC in Payon with one fruit and one empty bottle, and he asked what kind of juice I wanted to make.
I made my selection, and he said:
"Oh No... You don't have all the necessary materials. To make Grape Juice, I need 1 Grape and 1 Empty Potion Bottle. I will also need a 3 zeny fee."
So, yes... you apparently need Empty Potion Bottles, not mere Empty Bottles.
The wiki has now been updated with this information.
Empty Potion Bottles can be purchased at the Merchant Guild headquarters in Alberta, in the room on the left after you enter.
They can also be purchased from the Mage Assistant inside the Geffen Magic Academy.
Edited by jenkat, 24 February 2014 - 12:46 PM.