In short, don't bother. The fluid is upto health and safetly spec, however that just covers the chemicles used within the manufacture of the fluid itself, and not whether the floor becomes slippy or not.!
Use a bubble machine on a wood floor (as most schools and village halls have) and within a few minutes you'll have a floor resembling an ice rink

.
I've actually stopped stocking them, because they are dangerous, and basically the equivalant of sprinking a polished floor with soapy water.
If you want something different for kids parties - consider a snow machine!