The title of your post says "fishing kits" but the list of items appears to be for a PSK.
If I were to add one thing it would be a PLB and I would also hope that the boat is equipped with a marine band radio that someone is experienced with especially considering the spottiness of the cell phone reception.
Also the boat has appropriately sized life jackets for all and there is a set of oars in case of engine failure?
Good point about the thread title Teslinhiker. We're pretty well set up in terms for fishing and cottage gear. It's really an unexpected emergency I have in mind to prepare for. For them, an emergency would be a broken coffee maker, forgetting a key ingredient for dinner, loosing power to the music system or running out of wobbly pop.
None of us would be caught on the water without ifejackets or paddles, but I'm not sure about a radio on the boat. A radio or plb is a great idea. i carry a small air horn in my kit but a sparse audience on a big lake makes it less effective.