Sometimes I forget to pack a remote shutter release when I stumble upon an HDR scene. Luckily I can set up a Sony A7 series camera to shoot a bracketed series of images with a self-timer.
Press the Menu button on the upper-left backside of the camera. Navigate to the page 2 of the Image menu and scroll down to Bracket Settings. Press Ok.
Inside Bracket Settings, click on Self Timer.
I like to assign a 2-second self timer. Scroll down to BRK 2 and click Ok.
To shoot with the self-timer, all you need to do is enable the Continuous Bracketing Drive Mode (BRK C) and the camera will count down and take the shots when you press the shutter.