Whether it's a natural disaster like a flood, or you simply need to cross a body of water to get to safety, a raft will be very handy.
It's important to remember that it's not always a good idea to swim in these situations, even if you have the skills. The risks involved may be too many. After all, there is no point in trying to be a hero in survival situations. The goal is to come out alive.
Carrying a life raft is not a good idea, and stuffing it into your bug out bag is impossible. But with a knife, some long branches, cordage and trash bags you can build your own emergency raft.
Check out the following video to learn how.