how can u let water into ac circuit ? maybe we can see you on tomorrow or next week's newspaper, im not sure if your insurance cover your death or not, maybe they dont see this as accident, more like suicide.

you dont open up the unit when connecting water supply or powering it up. sequence is important for sensitive equipment like that, and usually device like this require electricians.

no, the water connection is outside the unit, water cannot go in unless the bath room is flooding up to the water heater height.