The head can still be the culperate, water can still go down the exhaust and not get in the oil. If the gasket or head are leaking into teh cylinder at a rate slow enough, the water will pass through the cylinder just as the air does. If the car still has the catalytic converter under it, the water will be evaporated and you will not see a sign or usually no smell.

With the engine off.

What you can do is get a cooling system pressure tester and pressurize the cooling system, it should hold pressure. If it doesn't, go to your tail pipe and listen for air noises. If it is only one cylinder that is leaking, it may be necessary to rotate the engine while trying to hear air. You can also pull your oil cap and listen for air coming from the crankcase, But usually if that is the case, you'll have oil and water mixin with evidence.

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Thanks, Nels
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86 300E
93 W250 4X4 Cummins Power
72 F250 Highboy
89 S-10 408ci BBC
custom V Four Chopper
77 Peterbilt 352
83 Jeep CJ-5