Problem I believe with intake manifold gasket or head gaskets

Hello, Go to an auto parts store, borrow a compression tester, and run the compression test on each cylinder. You may be leaking from the intake gasket, but you will need to prove good compression on all cylinders before diagnosing the intake manifold gasket. If you have low compression, pull the head. The other side of this is that the vehicle is over 20 years old, and the intake manifold gasket will be replaced as part of the head gasket. I say this becuase running the vehicle with water in the oil may result in damage to the engine, and a rebuild may be in your future.