“ You find a patch of edible funghi. They taste well and all, no ill effects. UNLESS you consume some beverage, even 3 (three) days after eating it. Then you become really sick with pains, vomiting, all the fancy stuff. As a gift or good meal, it could be a cruel joke or to make sure the heroes spend their time focused on the mission. And the fine soup you had in the inn yesterday could have some in.
(Inspired through a real-world fungus. Was really used to cure alcoholism.)”
“ Another real world thing. White tea. Can only be picked two days a year, the two days before the flowers blossom. Could be a similiar plant that...is the deadliest poison known, cure known diseases or psychosis, or a potent herb that just tastes awesome.”
“ Your Pillow> This magic pillow is "+2" comfort and remains cool despite the temperature. It also shrinks to the size of a cigarette box for easy transportation. These are WILDLY popular wth those who have to travel(especially adventurers) . They command a huge price far outside it's true value , sometimes selling for thousands of gold pieces in a world where stating fighters are often equiped w +2 Swords. The method of creation is lost but sevral enterprising mages are trying to recreate this, with no success.”