Water will make the oil look like chocolate .
To check compression you need to have the throttle wide open and crank the engine a good 6 to 10 times, disconnect the ignition module so the car will not fire .
Just pull the 3 pin plug of the module or pull the king lead .I wouldn't worry too much as they are all showing the same which is the most important factor .If any are over a bar different then something is up .