I don't have a livewell on my 1957 Arkansas Traveler boat and was thinking of using a large cooler filled with lake water and portable battery powered aerator. Would that work okay for 5 plus hours? We would like to return the fish back to the lake after the 4-5hrs and I figured this might work? What do ya'll think? Any suggestions? Do I need to change the water out or add ice to keep it cool every once in a while? What are the keys to keeping the fish alive and well during their 4-5hr stay?