...and now the water and pipe analogies begin....
To begin with the water and pipe analogies work for very basic analog circuits like simple Power Supplies and Lighting switch networks but when you move into more complicated circuits the analogies start to breakdown quickly. So don't become too dependent those type of analogies. Spent way to many man-hours with prospective engineering officers trying to get them to unlearn them from their basic electrical/electronic classes in college.
by the way the nominal resistance of a dry healthy human body is somewhere between 300 - 1000 ohms
20 gauge solid wire has ~ resistance of 10 mohm