For inexpensive bubble "juice"--put about a cup and a half of Ultra Dawn dishsoap and 2 tablespoons of corn syrup into an empty gallon jug. Add water to fill the jug.
It works best if you let it age overnight before using, and it keeps forever, so you can refill those little bubble bottles.
The corn syrup makes the bubbles last longer. In the fall of the year, you may have trouble with yellowjackets or wasps being attracted to the syrup, so sub glycerin from the drug store, or just leave it out.
I do a 4-H school enrichment program on the physics of bubbles, and this is what I use.
I just haven't been the same
since that house fell on my sister.