J.W.
I have a little boy who's also almost 2 1/2 years old, and he wants NOTHING to do with going on the 'potty'!
The only advice I can give you, coming from a former Kindergarten teacher and someone who has degrees in Early Childhood Ed., is don't push anything if your child is not ready--it'll only set the child back and he/she will be more resistant to even trying. Put the potty out and explain what it's for and how to use it, and go from there. Use your insticts!
Good Luck.