Where would I find or how would I build a laser driver for a 2W laser diode?
You just need a current source able to supply enough current to drive your laser (at the voltage it requires).

Driver circuits for lower-powered lasers take special care to avoid even very short voltage or current transients and to provide very good ESD protection. While such things wouldn't hurt in your case, a 2 W laser is likely to be much more robust to those kinds of transients than a 1 mW laser.

Properly heat-sinking your laser, on the othe hand, is likely to be an interesting engineering exercise.