when my old lady bonita was on antibiotics, i did them 2 ways:
-the towel.....-
make a birdy burrito. hold em to ur chest and shoot the meds down. prepare for spraying. 0/10
-the fake treat-
i would meander around the house with the syringe loaded pretending it was the greatest thing in the world. pretend to "keep it away" from ur bird, really get that jealousy going. then offer it like a treat after some tricks. 8/10 worked until she realized the treat tasted icky and was in fact, not a treat.
ive also heard of people using fruit juice to mix meds into but id def ask ur vet if its ok. when bonita was on antiemetics, i mixed them into cherry juice in a spoon and let her drink them. sometimes id put them on some grains of cooked white rice or quinoa. good luck!