It very well can be water around spark plugs and distributor. Or even any other electrical sensors, connectors etc.
However if your ignition wires are old and are not very flexible, it is possible to cause damage to them by trying to remove and re-connect. If this happens you will have two issues and will be difficult to figure which one is causing the misfire.
I would suggest just blowing compressed air around spark plugs, distributor and all exposed electrical connectors.
Re: Alarm. almost all systems are different from each other. Original installer or somebody with knowledge on same brand/model will be the solution. You might even need component replacement because water may have got into live circuits and caused damages.
Good luck.