If I was home alone, and then suddenly my house was transported back in time to the age of the cavemen, and I had to grab three thing and get out so I wont be lost in time, I would get my phone with the charger, some food, and blanket so I would not get cold during the night. I would find me a nice cave to stay in and carve an outlet so I can charge my phone. I would trade my food to stay with a pack of cavemen and then I would have people to hunt for me.