We will need a space suit on the landing shuttle because the pressure would make us explode.
We will need walkie-talkies for the landing shuttle so we can keep contact with each other through the walkie-talkies.
We will need the rock pick to collect rocks and minerals on mars.
We will need the mars rover to scout out new places.
We need drinking water because we will be very thirsty without it because of all of the walking that we will do.