we're struggling with the same issue atm. DD just spits it everywhere. I am BF'ing, so i use a syringe and put it right down the back of her throat and then quickly put my boob in her mouth. Or i have tried sticking the syringe in next to my nipple and squirting a little in. She is kind of cottoning on now though and lets go and spits it out about 50% of the time. So this morning i mixed it with juice and put it in a cup with a straw, the novelty was enough to get her to drink it. It's so hard isn't it?
The dr told me to block bub's nose, put some on the tounge and then they don't get the bitter taste and they swallow when you unblock the nose. This didn't work for us but maybe worth mentioning.....