You CAN make third potion with duplicating trick. Of course don't use this if you don't like to cheat. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
Btw, welcome to the forum Apeman.
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Just do the following to duplicate any item:
[*]Quicksave
[*]Choose item (or stack of items) from your inventory you wish to duplicate. Click & hold mouse button on that item.
[*]Drag the item to a different location out of the inventory (somewhere on the ground).
[*]Quick load (you may release mouse button after load starts, not before).