Sounds like a head gasket or perhaps a crack in the block. If you are feeding water into it but can't spot a puddle anywhere then it is ending up in the crankcase.
Check the following:
- What color is the oil? Light brown, milky looking? Water is in there.
- Is the engine beginning to miss? If so check the plugs and look for one that is wet (water). Your leak is near there.
- Compression test. Rent a tester from Autozone if nearby. Should be 140+ in each cylinder, with only a slight variance between them.
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