Red Cross’s Rediplan (https://www.redcross.org.au/prepare/) has an iOS and Android app that makes this simple to plan for all emergencies (not just for bushfires).
When I went to a Red Cross course a few years ago, they were big on the pillow case thing for kids - fill a pillow case with your fave teddy bear and clothes. They had ones made up that go through the process with them.
Old_man_shakes_fist_at_clouds.meme