Would Killian drink sugar water?

Try mixing up a stiff batch of sugar disolved in water - see if he'll lap it up...

Then try disolving the pill in the water...
followed by enough sugar to hide any taste of the pill. Probably best if there's only a minimum of water used - and LOTs of sugar.

Tried jelly yet?
How about Jell-O?

Keep trying - and we'll keep dreaming up ideas to try!