I have said this before, indirectly and I am saying it now, directly. A chump strategy is to look for interesting topics to talk about hoping to excite her.
If the topic is more interesting than the man, than it is no different than buying her a drink. She will be more interested in the topic than the man.
Your job, is to make sure the focus is on you. You are the stimulus, not the topic. So if the topic is interesting, you need to be higher energy to be even more interesting than the topic.
Don't worry about what to talk about. She will forget.
Do focus on the interaction and how you present yourself as an Alpha male. She will remember.