What tributes took supplies from the Cornucopia?what item did they take?
Actually, we don't know what they took. We were told what was available to them. There was:
"Food, containers of water, weapons, medicine, garments, firestarters. (pg 148)
They also had sleeping bags, plastic sheets, and tent packs.
Katniss and Peeta were told NOT to go for any of the supplies. Haymitch wanted them to leave immediately and go find some water. But Katniss couldn't resist and grabbed a back pack and a piece of plastic. The girl from District 2, who had half a dozen knives, threw a knife at her as she left, so she also had a knife.
It tells us that
"About a dozen or so tributes are hacking away at one another at the horn. Several lie dead already on the ground" (pg 151)
What each person got, however, we never really find out. We know that a girl got matches or a way to start a fire because she starts a fire that night and the Careers find her and kill her, and the Career tributes have flashlights.
Twenty-four tributes started out around the Cornucopia, and that night Katniss hears one of the Career tributes say,
"Twelve down, and eleven to go." (pg 159).
Eleven were killed in the initial fight for the supplies at the Cornucopia. They killed the girl with the fire.