Cruelberry

The material components of the spell are consumed after casting, causing 1d6+3 berries appear in your hand. They are infused with magic for the duration but lose their potency and dissolve into watery mush if they have not been consumed within 24 hours of the casting of this spell. Despite the berry's pleasant aroma and ability to provides enough nourishment to sustain a creature for one day, they have a foul taste and do not reduce the feeling of thirst or hunger. A creature can use its action to eat one berry, and must roll a CON save when doing so.

On a success, a berry restores 2HP. On a critical success, it also grants the consumer a hour of poison damage resistance.

On a failure, the consumer takes 1d4 poison damage the first round and half that damage (rounded down) every  subsequent round until they succeed their save. On a critical failure, the consumer takes a single round 2d4 poison damage, is violently sick for one the next (incapacitated), and has one level of exhaustion added to them.