You'll need to install electrical boxes in the ceiling. You may want to post this question in the Electrical Wiring forum to get their ideas on mounting the boxes.

Depending on how far down you are dropping the ceiling. If it is 3" mount a 54151LB light box to the floor/ceiling joist and add 2 box extensions to be even with your drop ceiling.
Or you can nail a 2x4 lenghth wise to your floor/ceiling joist to the distance of your drop ceiling and put the light box on the 2x4.