You may need to buy a brush and shovel to fix this one.......

But, to be sure..... Let the engine get
stone cold as in left overnight.
Check oil level and ensure its up to the mark, never mind the water header tank at the moment.
(edit after reading above previous post - remove plugs and turn engine over with plugs out. If water ejected from plug holes, it really seems broken)
If no water jetted out, see if the engine starts and the warning lights all go out as they should.
Dont let it run for more than, literally,
3 or 4 seconds.
If it sounds all good, you may have got away with it. Fix the heater hose, top up with water then start as normal ensuring all air is bled/burped out the system. Restart as per normal and listen for any strange noises or clatters. If there are, then it needs more severe spanner work.
Good luck......

edit - just read the above post. Water leaking from the exhaust joints on refilling does not sound at all good........