What kind of water is best for soap bubble?

Sample formulae
1.General purpose formula:
o2/3 cup dishwashing detergent
o1 gallon water
o35 ml glycerin
2.Another general purpose formula:
o100 g sugar
o40 ml salt
o1.4 l water (distilled water is better)
o150 ml dish washing detergent
o12 ml glycerin
3.Yet another general purpose formula:
o1 part of washing-up detergent
o2 parts of glycerin
o3 parts of water
4.For long living bubbles:
o1/3 cup commercial bubble solution
o1/3 cup water
o1/3 cup glycerin
5.For no-tears soap bubbles:
o60 ml baby shampoo
o200 ml water
o45 ml corn syrup

Soft water is the term used to describe types of water that contain few or no calcium or magnesium ions whereas hard water, does contain significant amounts of such ions.

If the water is very soft, soap will tend to lather up easily when agitated, whereas with hard water it will not.

Soft water usually originates from peat or igneous rock sources, such as granite but may also derive from sandstone sources, since such sedimentary rocks are usually low in calcium and magnesium.

http://bubblemania.com/faq/

distilled water!