Broke my water pump bolt. Now what? (Update - broken bolt is out)

Out of the car means it's easy to transport to your friend with a welder...
EZ outs are anything but EZ, they are tools of the devil....
Drill it out? Sure, what happens if your off center a little....

I would grab a nut, drill half way through it to create a larger area to weld to, screw the threaded side of the nut on to what's left of the bolt & burn it in hot... As others have mentioned the heat is a big part of makes the method so successful, the heat & the fact you get a good secure place to use your wrench...