Shillelagh Oil

As a bonus action you may splash a wooden weapon with this oil, it has the same effect as the spell Shillelagh.

(The wood of a club or quarterstaff you are holding is
imbued with nature's power. For the duration, you
can use your spellcasting ability instead of Strength
for the attack and damage rolls using this weapon,
and the damage die becomes a d8. The weapon also
becomes magical. The spell ends if you cast it again
or let go of the weapon.)