Try using a warm washcloth on the kittens nose to help clear it up. A nasal syringe is not made for a kitten's nose. I doubt you will find one that will fit up the nasal passage sufficiently to do any good.
At two months old it is not necessary to give the kittens milk of any kind. Water is sufficient. Unless, of course, you are having issues trying to get the kitten to eat enough to help. As L4H mentioned the best food available is kitten Wellness. It did marvels for my latest gang.
Please watch the kittens closely after administering Convenia. There have been some very severe reactions to that medication. http://www.felinediabetes.com/phorum...1905168,page=1
Have you tried taking the kitten into a small bathroom with you and letting the shower run on hot to steam up the room? That may help to loosen all of the mucus and make her feel a little better.
As L4H said, I also caution against using too many human meds. Most are just not safe.