Can water cause fermented pickles to spoil?
ANY amount of water on the jar or the ingredients does result in the formation of whitish fungus at the affected spot. This will later turn black and the pickle will sour giving off a fermented smell. 

The only exception is if that spot is well immersed in oil- but no guarantee it is off!
The "water" in the fruit, being juice, fights formation of fungus and mold.

I'd tried to cheat but the punishment by the pickle is heavy!! -and I am a cookaholic going on 60 years.

Note: This precaution applies especially to hot climates where the reaction is in hours and max in a couple of days--- hv observed it in u.s in Florida and California.
Try your bravery.