Recently picked up a Bubble Fogger on clearance from Target for $18. What can I use in it for bubble fluid? Any old children's bubble fluid? Haven't unboxed yet but guessing there will be some language about "use only bubble fluid approved for this device." Want to avoid any unnecessary expensive purchases--but also don't want to damage the device. Also, can I create my own bubble fluid using dish detergent, e.g. perhaps with distilled water if necessary.