2002 Mercedes Benz E320 starter wont crank over

Hello, my car broke the ventilator belt, (very fron of the car, that drives the aircon/alternatorwater pump)

the computer told me I had alternator/batteri failure, but I tryed to drive the car to the nearest exit, but it stopped after 1-2 miles, and whas in 1000 rpm, amy english is bad sry. Hope you know what I mean, after full stop, then it would drive again up to like 50 mph, then stopped again and went back to 1000 rpm, I tryed a last time to get to nearest exit, and it stoped again to 1000 rpm, then I turned off the engine (no smoke) then after like 20 sec I tryed to start it again, but it sounded like there whas to low power on the battery, it cranked over like 3 times then I stopped, then it started to smoke pretty mutch for like 15-20 sec.

i then tryed to bye a new battery ( I still didnt know it whas the ventilator belt at this time ), just thought it whas the alternator, and I whas told a new battery would atleast drive me 5 miles, to neares workshop, so I did that to avoid pulling, but the car just clicked, no crank over, then I had the car pulled home, and I tryed to charge the new and old battery like 20 hours each, and with both battery's it wont crank over.

the car got hot, but not for long, and lost like 2 liters of water thats it. Is this a blown engine? Or could there be another reason for this? It whas a very good moter with no engine noise before this and not either when the engine stopped to 1000 rpm, still sounded like normal, no smoke after I turned it off either, but smoke after I tryed to start it again? Never seen this before.

i very mutch hope you can help, as I have finansial problems atm, and dont wanna spend alot of money for nothing.

one more thing, the ventilator belt or whatever its called whas totally ripped in pieces, not only broken, it whas in many, many thin pieces.