Is there a 'quick and dirty' way to determine a liquid's surface tension?

Not sure really what this sort of measurement would entail.....  Reason I ask is, I am getting the bug to do a bit of tabletop mad science involving making up my own fountain pen ink, in various formulations.  Ink chemistry is pretty interesting and a lot more complex then, say, paint.  Having fun starting with Prussian Blue + binder, and I intend to experiment with various additives, etc, in careful and recorded measure. 

Anyway, will be experimenting with ways to slightly lower the surface tension, which needs to be a bit less than that of distilled water to perform best.  Lots of ways to record this, but would like to have quantifiable data if possible.

Thanks y'all in advance,
diogenesNY