I second the hang the ignition key on the raw water intake valve.
We also turn off our fuel line since we have a gas engine (A4). It is usually pretty easy to remember that both valves need to be opened as there is only enough gas after the valve to run for a few minutes without cutting out.
There probably was some water in the water pumps impeller chamber that provided lubrication.
Keep trying. I hear that persistence usually pays off. Next time try letting the fuel level in the tank go way down and see if you can clean some of the crud in your diesel tank out with the boats filters. I hear this is a pretty good method for needing a tow unless you have spare filters, extra fuel and know how to bleed the fuel line once the new filters are in place.
Hope you are well.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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