Is it possible to make a complete analogy between electricity and something more graspable? (e.g. fluids)
Using analogies to fluid dynamics (air/water) is useful for some purposes for the complete novice, but it also can lead to confusion. If someone really wants to understand electricity, they need to dispense with the fluid analogies and just learn how electrical fields and charges work. There really isn't a global analogy.

I find it useful to refer to William J. Beaty's articles about electrical misconceptions.

Also to the web site All About Circuits.

And finally, the more in-depth reference book, The Art of Electronics by Paul Horowitz and Winfield Hill.