Chino my waifu
Why need a opening tool lol
Have you ever tried any guide to recover your phone from getting water? If not, go for it. I suggest you using recover mode at first, as it has response on the screen. Turn on your phone, and when it shows Apple logo, release power button then long press the home button. If it works it will show "Connect to iTunse".
There is no normal way to install Mac OS on normal PC, for limits of Apple. You can Google "Hackintosh" for installing Mac OS on a Windows PC.
no you cant if you turned on Find My iPhone. if you follow this guide while turning Find My iPhone on, when you make activation then it will require you type the apple id existed before. now this guide cant remove password.