need to/don`t need to or must/mustn`t

I am making some sandwiches so you .......... brink any food
We`ll also ........... bring some plastic plates and cups.
We`ll have the picnic near the lake so i ........... forget to bring a blanket to sit on.
I think the weather will be good tomorrow so we ........... take coats, but we ............ remember sun cream.