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Anne,
The key to bacteria survival is OXYGEN.
I would borrow (or buy, they always is a day when one comes handy) an air pump operating at 12V DC. Breeders use them to aerate the fish transport tanks on the back of the truck. They usually come with a connector for the truck's cigarette lighter. It would work fine for a few hours from a car battery.
Open the top of the bead filter (remove the head) and place an air stone as low as you can.
That should do it for the length of your trip.
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