There is no gameplay way to get the flasks after Elrath is arrested. However, you can get back in the basement either by hex editing (Teleporting Anywhere) or file swapping (FIX for the Missing Catacombs Portal).

Alternately, you can just get another set of potions (Lost Items - guide and directory of inventory files).


By design there are only 2 cure potions in the game, but 3 victims. You can Pickpocket (level 2) a potion back from a cured person, kill one after curing (with no loss of reputation) to get them to drop the potion, or duplicate the potions before using either.
To copy a stackable item
Drag a stack out of (or into) your inventory (or container) and hold down the control key before dropping. This will bring up the split stack pane; type in a negative number and hit enter (the checkmark will be greyed out). This can also be done in the trade window.


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