

It’s not regional branding or genericide which is the term for what your talking about where a brand name becomes the generic usage for a product in place of the generic name (i.e. Kleenex instead of facial tissue, Velcro instead of hook and loop etc.)
Flavor Aid and Kool Aid are two distinctly branded products made by two different companies. When I have more time I’ll see if I can dig up the interesting write up I read about this from the Kool Aid company perspective at the time and post it in an edit.
I couldn’t find it which is too bad because it was an interesting op/ed piece from what I remember by some exec who worked for Kraft at the time on the Kool Aid product and how they panicked and freaked out, especially since the day of the mass suicide it was Flavor-aid.
I also so some sources, when I was looking, that said Kool aid was present on the compound and had been used in earlier tests by Jones so that added to the confusion.