1. Enter Beginning World.
2. Begin going through your inventory, throwing away all items with the exception of Potion As, Bs, Cs and the three Lightnings (which should all be given to Ark for further Majesty conservation).
3. Give Telmia and Jean's Potion Bs over to Ark to hold so he has five, with the remaining Bs going to any of the other Group Leaders (you'll have Eberle back before you should start needing to use them on bosses). Also, hand any and all Potion Cs to Ivy, just in case of severe attacks on the group as a whole before getting the Heal Ring (you do have to go through a few rooms that spew fireballs at you before finding it).
4. Make Jean continually make Potion As until you are out of room.
5. Give the Potion As to people until everyone has two.
6. Fill up Ark and Ivy's inventory slots, then to each pioneer you get in order from Halley to Eberle, repeating Step 4 as necessary.
7. Any extras should be tossed in Halley's inventory.
If you need some of the items you recycled, you can make them once you get the ability to grind on more CIMA than just Wogs. Since potions are something most people will need and Lightnings are necessary to defeat Bruton, this allows you to be set up early in the game. Once you get Eberle, you can make Potion As cheaply and this constant recycling isn't as necessary. Plus, if you farm for Trust on Wogs once you see the cutscene with Pike in the boss room, you can get positive Trust for additional Potion making once you acquire the characters, allowing you to make more easy ones once you find Eberle in Cold Snow (if you want to see all the Trust conversations, you can use just her and Jean and only get them to minimal positive Trust).