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Croatian Air Force uses six CL-415 planes, as well as the six AT 802s for (mainly) firefighting purposes. Another amphibian is the Russian Beriev Be-200. It can carry a maximum payload of about 3,170 US gallons (12,000 l) of water, making scoops in suitable stretches of water in 14 seconds.
When aeronautics was in its early years people with daring took on as much fuel as they could to fly over great distances with quite inefficient engines. I suppose the answer is: an airplane can hold as much fuel as the maximum take-off weight for that particular plane is. Of course, getting extra fuel tanks in there, and connecting them to the intake is huge work, and I don't think people much do long-distance flying with small planes these days, since all the records have been set, even for a non-refuel flight across the world.