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How to do it
These recipes have gotten around a lot, chased by feedback from people who say it didn't work. Most people's water has enough "hardness" in a bathtubful of it to turn a large amount of soap (meaning actual-soap soap, such as castile) entirely into curds and then scum, making no bubbles. Even if your water is "soft" enough that you can use a reasonable amount of soap to make it foamy, you wind up with a very soapy bath, with water that's grease-cutting enough to serve as laundry or dish water. The "icky chemicals" in bubble baths foam regardless of water "hardness" and in concentrations low enough so as not to turn the bath into a detergent solution. DIY is not a bad idea for bubble bath, but you need to use typical bubble bath chemicals, not soap, to make one satisfactory for most users.