Since arriving in Castaway Cove, one of the traveling merchants has been being unkind to her poor husband.
This errand is available to complete after arriving in Castaway Cove with the Letter of Passage from the Cowlipha.
Talk to the woman arguing with her husband on the northern walkway. She definitely appears to lack kindness. The woman carrying a basket on her head - located on the other, southern side of town - has plenty to spare, so arrange the exchange and retrieve the reward.