Probably the handgun, body armor, jeep, and flashlight. On the first few days the jeep will offer mobility and storage, while the flashlight is necessary for maximizing the search for gear. Handgun and body armor to give you an advantage over your fellow survivors. Then acquire a boat, food, containers, and other resources and become a pirate. I might consider a fire axe or crow bar necessary if everything wasn’t glass doors and easily breakable locks.