if its on the inside of the cylinder, its a blown headgasket that's leaking your water/antifreeze.
water could have gotten into the spark plug holes. water + spark= no good. Only a few spark plugs could be firing, take them out, and check for water.
water ha ha ha
You have a serious internal engine failure.
The seals in the pump are leaking and the pump needs to be replaced.
If you have water on your spark plugs you have a serious problem. That is coolant you see and not water. You have a blown head gasket or cracked head. This engine will self destruct if you continue to drive it. Have this repaired ASAP and stop driving it until you do.
Water
The water pump on a Vectra 2.0 DTL is located just behind and to the right of the crankshaft pulley. This is on the front of the motor. One easy way to find a water pump is to trace where the hoses go from the radiator.
Colander
It depends on if you mean in the cylinder, or just water in the spark plug hole. If the a/c is low on freon, the a/c line will sweat and fill the valley of the valve cover up with water, which in turn overcomes the integrity of the coil pack boot seal and fills the holes up, which jumps fire from the coil conducter spring to the cylinder head and causes a misfire. If the electrode/ground strap has anti-freeze on it, then you have head gasket/severe cooling system issues...
For example,when ice thaws, it becomes water, which can go into holes of a rock. When the water freezes, it expands & puts pressure on the rock which causes it to break apart/weather
where does a giraffe get water
Drain is partially clogged or the vent pipe is stopped up. Also check the vent holes underneath the rim of the toilet and clean them out.