My oldest son’s obsession is blowing bubbles. If he’s awake, it’s what he wants to do. If he doesn’t want to do something, offering to let him blow bubbles if he does that something often works.

The trouble is that an 8 ounce bottle lasts him about an hour and costs between 75 cents and a dollar. That can make for an expensive 3-day weekend, unless you make it yourself.I’ve seen a number of recipes. The recipe I tried may not be the best, but it’s better than any of the commercial formulations we’ve tried.

I took 1/4 cup of Costco dish detergent (it was what I had), 1/2 cup of water, and a tablespoon of sugar, which I stirred and poured into his used bubble bottle.

Most recipes suggest Dawn or Joy. For these purposes, I’m sure concentration matters a lot more than brand. Some recipes call for glycerin or corn syrup instead of sugar. Corn syrup and glycerin aren’t things I have any other reason to keep around, so I used sugar.

The concoction left enough room in his 8-ounce bottle to make it easier to use.

Google says a gallon of Dawn costs $15 at warehouse stores. That would make 64 refills, cutting the cost to about 25 cents a pop. I don’t remember what the Costco brand costs, but it’s probably less than that.