I'm not looking to make foaming soap. I'm looking to thicken Castille soap so that it doesn't run through one of these: https://www.amazon.com/Better-Living-71355-3-Chamber-Dispenser/dp/B00004TUBM/

Right now the soap drips all the way through the container and out the bottom. Other soaps and shampoos remain in the container.

If the soap is only going to last a month then that's useless to me.