Water is running out of by tailpipe when I pour water in the radiator

That's caused by a leaking cylinder head gasket. In worse cases the cylinder head can also be warped, and in rare cases the head can be cracked.

Can it be fixed? and is it expensive?

yes, it can be fixed. yes it is expensive. a simple head gasket repair would be around 800-1000. if there is head damage, it would add another 500-700

Roy

Thanks so very much Roy, cud you tell me what would be a good used reliable car( a name brand) to purchase, for round 500- 1000$.

thats a small budget.
Look for a toyota, subaru, nissan . they will be high miles for the price you have to spend but they are the most reliable

Roy

Thank u so very much 4 ur help(Roy).