if it was a tablet (don't know how this will work with liquids) you could make a suppository, using copha to the size of a capsule, then stick it where suppositories are supposed to go

We did this to my nieces & nephews when they wouldn't take their tablets, I also learnt in my Herbal Preparation classes (I'm doing a bachelor of health science, major in naturopathy). On of my girlfriends in the class, swears by making suppositories to get medication into her 3 year old son & 4 year old daughter (she sometimes uses pessaries for her).

Recipe
Get some copha, get to malleable temperature (melt & then let it cool & start to harden again), crush tablet, mix with copha, mould into capsule size, let harden