As with any type of essay like this, I think that narrowing your terms and clearly harnessing your focus is going to be critical. The first step I would take in a paper like this would be to focus attention on defining "counterculture" in America of the 1960s. I think that this is going to be dependent on stating the conditions that gave rise to the counterculture, articulating what it sought to bring out and its primary motivation. After defining this in terms of the goals and purposes of the counterculture, I think that being able to integrate your understanding of the feminist movement of the 1960s is going to essential to your paper. You will have to strongly link the purpose of the feminism as part of the larger configuration of the counterculture that provided the umbrella for it as part of the social setting of the time period. Being able to define the counterculture and then expressing how the beginnings of the feminist movement as a part of this is going to be critical. For example, if you define and explain counterculture as part of the overall repudiation of traditional standards and expectations for behavior, then feminism can be integrated into this as it was a call for the changing face and dynamic of what it meant to be a woman. In doing this, I think that you will be able to go far in being able to compose an essay on counterculture and feminism.