I have a small puddle beneath my rear right axle, under the leaf springs. I need to figure out if it is brake fluid from the rear, right drum brake or power steering fluid from the power top system. Both fluids are clear. Any way to test? Smell? Does one burn? Taste (maybe not)

Thoughts??

Typically the top pump has transmission fluid (red). If brake fluid leaks at the rear brake piston it'll whip around in the backside of the wheel making a mess. Also check your master cyl.
for proper level.

Could be an axle seal too. I would suggest that you pull the tire and drum and take a look.