Ya know how I keep my equipment dry when it's raining out, I stay indoors. LOL. Seriously, that's really what I do, I just don't go out when it's raining. I was co-teaching a workshop with Jack Graham and it was raining and we had to power on through the rain to keep the clients shooting.  There are many commercially made products to put over your camera and lens to keep it dry, but the cheapest and easiest way to keep the camera dry, is to just use a garbage bag over the camera until it's time to shoot and then just lift up the bag over the lens hood and the cameras view finder, line up shot and shoot. Move the bag back down after the shot.