1 c. Joy or Dawn dishwashing liquid
3-4 tbsp. glycerin (from Pharmacy)
10 c. clean cold water, up to 50% more on dry days

Measure 10 cups water into a clean 2-5 gallon bucket. Add dishwashing liquid and glycerin and stir gently to avoid froth. A lot of bubbles for a lot of kids, you may wish to use 1/4 of recipe.