I have a 96 cr125, it overheated an i think the jug is cracked.?

The guy i bought it from had the top end rebuilt but i guess forgot to put a radiator hose clamp on so when i was ridin came off an leeked all the coolant. it locked the motor up and i think cracked the jug. it will still run but when i take the plug out it has water on it. i didnt feel like messin with it so its just been sitting in the garage. i would just like to know if i should just replace the jug or what to do... please help a brotha out!! ha