Exellent berry

You use up to 15 frost berries (which are consumed) in your hand and  infuse them with magic for the duration. Any creature can use its action to eat one berry. Eating a berry restores 40 hit point, and the berry provides enough nourishment to sustain a creature for one week. 

The berries lose their magical properties if they have not been consumed within 26 hours of the casting of this spell.