Ran hot and died while adding water to rad now wont start

If your lucky its just vapor lock. but as above check oil is it white milky then blew head gasket.
Very hot engine and cold water don't mix, causes steam and vapor locks.
Next time let it cool then add water.
When cold crank it over a few times with thermostat out.put back thermo then add coolant and test.
fix the problem that was causing it to overheat in the first place

Hope this helps let me know Mike

Blown headgasket is most likely. Possibly cracked head/block (water may be in the oil) If you are lucky, the spark plug wires are just wet and killing spark. Hard to tell with no vehicle information.