Using a ruler, measure 1/2″ from the bottom of the dispenser. Fill the empty soap dispenser with regular soap up to this 1/2″ mark. Then add water to fill the dispenser so it is 3/4 of the way full. Replace the lid on the dispenser, shake a few times and you have a foaming dispenser filled and ready for use. I’ve used various dish soaps (i.e., Dawn, Palmolive, Joy) as well as Dawn Hand Renewal with Olay Beauty and they work great! The only soaps that might not work too well in this context are the heavily lotioned soaps.