My suspicions were confirmed.
The first word from the raspberry punch was "BLOOD", and the second word, from the lime punch, was "FRESH". This was confirmed when the towellette replied "FRESH" from being dipped in blood. The third word, from the orange punch, translated to "SUNLIGHT". From my previous research near the Damp Creek of Dunsmoore, I knew that fresh blood was a common meal for a certain league of creatures, and that sunlight was a way to kill them.
It seems the towellette was warning me: Here there be vampires.
I have yet to translate GNRONCKIE and LUIGLNTOEI but I feel assured that my research will reveal these meanings shortly.