Get a battery powered aerator and a cooler or even a bucket. I've found the most important thing is to keep the temperature stable in the bucket. A cooler helps with this but it isn't even that difficult in a bucket. Just means monitoring the temperature and changing the water out with the lake water regularly.
I always change the water in the bucket right before I leave wherever I caught the fish. Then once I get home, I start a slow drip from the tank they're going to stay in, to the bucket they're currently in. I give that a few hours (still with an aerator attached to the bucket) before I introduce the fish to the tank.
I never take fish if I don't plan on going directly home to the tank they're going to live in. If you have to wait 16 hours, I'd reconsider and try to find fish closer to where my tank is located. Not that it isnt possible to keep the fish alive for over 16 hours in transport, it's just very difficult and if you're just transporting local panfish, I'd just catch them closer to home.
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