How can I create an enclosure that will protect an indoor camera outdoors?
If it is not rated for outdoors it will fail eventually. All professional outdoor camera housings have vents to allow them to breathe. It is a fact that moisture is going to get to your camera no matter what you build and since it is not rated to handle it it will fail. If you rig something yourself and attempt to seal it tight you'll wind up with condensation on the inside of the container and that will not only ruin your camera but you won't be able to see anything because of the water droplets that you cannot wipe off in a sealed bottle.