It's nothing to do with the boiling water out of the oil, fact is you currently have a sump full off emulsified oil, oil that is supposed to provide a friction free surface on the critical parts of the engine which is something emulsified oil isn't going to do. If you don't need to drive it, park it up until you can get yourself some oil and do it then, alternately, drop the milkshake from the sump, put it in one of your mothers sauce pans and boil the water off that way but don't run it in the engine as you will do more damage. Now just think, if the rockers weren't getting oil, what else wasn't getting oil whilst that engine was running....
The correct way to torque up rocker arm bolts is with a torque wrench and making sure the lifter is on the base circle of the cam to get a proper torque reading on the bolts. BTW, the stock rocker bolts at TTY and should be thrown away and new ones used when fitting the rockers again.