Nothing anywhere I can find seems to say what is in those bait buddies tablets. The description, that it just "Bubbles for hours", makes me wonder if it's just adding oxygen by circulating the water. Could just be a bakingsoda/acid reaction. And anyway if you put that in a closed bag it would build up pressure until the bag explodes.
I'd just use an air pump, get a 12v one and power it off the car. Any stops you make they'll be fine for an hour or two.
I'd just use an air pump, get a 12v one and power it off the car. Any stops you make they'll be fine for an hour or two.