i think he means alive while out in the boat or on shore....without buying a live well or something.
i would just keep switching out the water. if its a long car ride home i would stop and do water changes. might also get one of those car adaptor plug ins so you can plug in an aiirator.
i can keep shiners and chubs alive and smaller fish for 4 hr drive with just a minnow bucket and filling it up with cold water (they are use to cold water) and putting in a bunch of ice. i think the ice releases oxygen as it melts