You can buy a drill for tiles or just put a bit of sticky tape on the tile and drill through NOT on hammer until through the tile.
Start small and step up the drill size.
Tungsten carbide is what you want...£80000 a ton, £80 a kilogram.
Check out any old drill bits or cutters.It's not as magnetic as steel and does not rust.
Show us a pic of the tap thread.If it's just a normal 3/4 tap thread then just buy what i showed above but both ends female and use some ptfe tape to seal it.