What appears to be a foul smelling olive oil, is actually one of the Grand Enchantments of the Alchemical craft. It is an alchemical tool used to make flesh as moldable and mergable as clay.
A potion of great strength, it is a finely brewed tea that restores Constitution, as well as gives the drinker an unusual burst of Strength, due to the high levels of caffine. Tastes great chilled and with a drop of honey and lemon.
Itching dust makes someone or something itch. It is very distracting and only gets worse until the dust wears out or an antidote is applied.
The player characters, experienced and somewhat well known, hear rumors and travelers' tales about a distant area being overrun by dragons (or other terrifying monstrosities). The locals have sent them a message, begging for heroic aid.
When they investigate, they discover that nothing of the sort is going on. It turns out that a group of thieves wanted them out of the way so that they could rob them (or someone who would normally receive their protection).