J.P.
Here's a recipe..............
http://chemistry.about.com/cs/howtos/ht/bubblesolution.htm
But... that would mean you'd probably have to buy glycerin. (It goes a long way) REally.... I am sure just a good dishsoap like Dawn, would work without it, though. I know you said you don't want to buy any ...... but it probably would be cheaper than using your dishsoap and buying glycerin. Dollar Tree has large bottles of it for that's right..... a buck! I think Target's dollar section has some too. But.... if you just don't want to go out and shop today, just try using dishsoap w/o the glycerin..... maybe it will still work.