Kawasaki brand "Aluma Cool" product is an ethylene glycol base.
I can't say if that is what 'comes in it from the factory' tho, I would assume ethylene glycol base did.
as for flushing... why waste distilled water..?
flush a couple times with tap water first (drain, fill, run, drain), then do a single distilled water flush, as the final step, before adding whatever different type coolant you chose.
Lots of nooks and crannies to get cleaned trying to accomplish it in one single flush.