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There appears to be a gap in your chronology of events. When you had the vehicle towed, to where was it taken? What was the code that caused the check engine light to illuminate? Did the code indicate a problem with the water pump? A bad water pump would probably not cause the engine to die. Water pumps are often replaced when the timing belt is replaced. Do you have maintenance receipts that would indicate if these services were done? Coolant leakage into the engine is often due to a cylinder head gasket leak. As long as the engine hadn't overheated long enough to damage the cylinder head, the gasket(s) can be replaced at far less cost than an engine rebuild/replacement. Sometimes the size of the coolant leak would determine how prevalent the coolant smell is. A coolant test can be performed to see if combustion gasses are present. First, determine for certain whether you have a head gasket leak. If you don't, what is causing the drop in coolant level. Second, if one or more coils are bad, have them all replaced. If you delay this too long, your catalytic converter may be damaged from unburned fuel.