Zombie apocalypse

On the fatal day of April 4th, 2036 a bio weapon called XP 5627 was released by a man named Robert Onster. It killed 97% of the human population. However the people killed came back, as zombies. 13 year old Striker and his 10 year old sister Alanna were some of the lucky ones to survive. Striker grabbed his dad's old rifle and a box of ammo. He filled a bag with food, water, some extra clothes, some matches, and a tent. He handed his sister a small pistol. Striker was a very smart kid. He got in his dad's truck and drove it to who knows where. He just needed to leave. This is wear his adventure began.