Oh my gosh, how scary

! He is strong though, and I'm sure he will recover from the head trauma, with all your care and love. He still looks just darling in his pics, even w/ that little tongue hangin' out from the Morphine.
Have you tried the water yet? Just be a little careful just in case his swallowing mechanism is a little funny. I like your thought of putting water on his tongue at first, until you know he is swallowing okay (you could use honey or karo water too).
Momo will be in my thoughts all day and I'll be looking for your update after you go the regular vet. Hang in there.