Can I save peanut oil from turkey fryer after rain?
Generic, short answer, just to make sure a potentially dangerous state of things is not left uncommented.

Certainly unsafe for deep frying at that scale unless you can guarantee you got all the water out - any water separating out tends to collect at the bottom of the vessel, where it can boil suddenly when the setup is heated again, propelling hot oil out of the vessel. Hot oil being propelled in any way is usually very unsafe.