blown head gasket, chocolate milk!

Probably put a fresh oil change on it with a pint of seafoam to pick up the water. Drop that out after bringing the engine up to temp. Install New oil and Filter and go again.

Where you will run into trouble is when you leave the water in the oil for days at a time . . internal component rust.

Also straight distilled water in your cooling system is a bad idea, instant rust. Need some anti-freeze in it for anti corrosion, even if it is only 2 quarts.