Will this bolt straight into my reservoir without any adapters?

Yes. This pump is built to factory mounting specs for your model year — it seats into the reservoir the same way the original did. No adapters or modifications needed.

Do I need to drain the whole reservoir to swap this out?

You don't have to, but it's easier if you do. Most people drain it, unplug the old pump, pull it out, and drop the new one in. Takes about 10 minutes with basic tools.

What if the pump doesn't spray the same way after installation?

Check your hose routing first — sometimes a kink or disconnected line is the culprit, not the pump. If spray pattern is weak across the board, the nozzles on your hood might need cleaning. The pump itself delivers what the factory designed.