Dream About Zombie Apocalypse Survival Future Time Travel

I had a dream that started inba zombie apocalypse,bit was in third person point of view and it was what I presume to be the main character of the story at first attempting to find somewhere to hide to survive. They had some close encounters with the zombies and eventually found a group of humans that had closed off their floor of a building from the zombies. The character followed them there and the whole floor was all the neighbors that lived in the floor. They had form an alliance together to survive the zombies. They collected resources and one time the zombies were trying to break in through the elevator so they had to destroy it with a heavy machine just to be able to stay which in turn also doomed them because they couldn't go out anymore nor go to the other floors. The people survived somewhat peacefully while always full of anxiety from the zombies for months even years. We had a time skip that passed over all the time they survived until one day my character got curious to see through the window and the world had become greener and beautiful and the neighbor explained to her that the zombies have not been seen in months and now there seems to be people again walking through the world. The people started running out of supplies so they decided to attempt to go outside the building through climbing out of the elevator that had been destroyed years before and down some floors towards the floor below them that had an opened wall that lead outside. When we went down the air was slightly thingy and when they approached a small stream to take water they found out the water was not suitable for us to drink. We got found by people and the people look weird. Our neighbor that always stared at the window said that the people were from the zombies that existed, the world became pretty much deadly for us who had been used to the same air from the building floor for years. We headed back up avoiding the now human zombies who also wanted to kill us and locked ourselves in again. They said they had enough water but they would end up simply living and dying in this floor. The story changes characters throughout the first part but then it switches to a female character that resembled myself for the second part. She finds out that there was a gate of time in our apartment complex and walks through it, this leads her to a distant future where everything is advanced in technology and the fashion sense is completely different. She gets scared at first but starts walking around the city she was dropped at. People look at her weirdly so she attempts to hide and conceal herself all the time, she changes clothes and tries to figure out how this world works while trying to seem like a normal citizen. She starts wondering if this could be a place for the group to live but then she gets found out by a sheriff who's goal is to kill her because to the people in this timeline she is a danger and could be an alien. She hides while appearing as if she was shopping and one night she goes to a tent behind a house to sleep. In the morning she finds a girl that seems strangely like her except the position of some of her facial features. They talk and the girl tells the character from another time about the world. My character then starts living concealing her identity as the girl she found. he looks for a hiding spot for her neighbors and friends as she is constantly being trained by the sheriff who sometimes caches her doing something unordinary but she escapes. She finds a secret vault inside a store that has nothing but a big spacious room, as if it was a secret room that was created with magic. She can't hear the people outside and whatever she does doesn't affect the outside. She believes she could live her with the neighbors but the only problem is that inside a store there's sometimes people near the shelf and though they can't go in they could report her if they see her go in. Then the story changes to another character, a male character. He goes through the same time wrap as the previous girl and finds himself in this other world. He walks around with his old time clothes while people stare at him with hatred. He proceeded to try to appear normal too before anything happens. Then I have a back and forth of who I'm following between the girl and the boy. They end up meeting together and she shows him the secret room, they also find their look alikes and take their identity when necessary as the sheriff hunts them down. They start taking things back through the time gate to their original timeline and give it to the neighbors for them to survive and have fun. The building creaks and we slowly start seeing more crumbling of pieces in the building, this means that the building will surely collapse and we have to find somewhere else to live quick. With our world being completely unstable even on the air for us, we decide the future is our only bet as the boy and girl walk back through Again. This time they focus on trying to discover the world and how it works while shopping or visiting attractions. We find out that because we come from a world where the air and everything around us was heavier we have more developed strength than the average human in this land, but we also sit and have different proportions. The female character starts shopping copying other's movement and sometimes seems like she would raise suspicion but she gets through it. The male goes to an attraction (a haunted house) with the friends of the identity he's representing. In the haunted house they have to hide from the ghost when it's attacking and keep their sanity up to survive. They walk around and then the hunting music starts as they run to hide. The first time was in a clothes wardrobe, the male turned invisible and hid behind curtains so the first friend was the one who died. The second time the other friend hid somewhere while he hid in a closet. The second friend died and through the speakers said that he had to escape through the neighbors door. The male from the other world didn't even know the layout of the house so he walked around aimlessly taking sanity pills, this raised some suspicion in the friends as they yelled at him to exit the house. He hid inside a trash bag and went through a door that lead to the balcony. Since he had superhuman strength he jumped down the house balconies to land safely on the ground. He walked normally as if he had exit from the back and not the roof and went towards his friend's bike to go home. The bike was very futuristic with buttons and letters he didn't know what they were for, he read a quick manual to revive his friends and eventually found the way. He tried pedaling away but his anatomy was not made for the bike as he kept failing. The sheriff noticed this and started trailing him. The boy had to learn to pedal and try to loose the sheriff as he biked all the way to his identity's home. The sheriff pulled him over and awaited for the father of the boy he was passing off as came out. The sheriff and father talked and he took the opportunity to escape. The female finds more of her neighbors in this world but to not raise suspicion from the authority she acts as if she didn't know them, they understand as they take items back to their world. The male and the female meet up again and they don't know what to do or where to live. They watch the city from above a hill him on his bike and her on foot.