Your assignment has actually given you a very clear outline. I suggest that you turn each of the sections into a question and use that question to develop each part of your paper. I would put these questions in bold print headers in the paper. However, before you turn that in, be sure your instructor allows this. Another way to do this is to use the question as the first sentence in each paragraph (or section). Here is how I would organize the paper with the questions:
Introduction: describe what the problem was, or what the situation with the patient is that made you feel this was a good activity. This paragraph can end with something like: What is the best activity to help the patient be able to eat independently?
1. What is the best activity to solve the problem?: describe the plan and why you chose that plan. Your reflection here would be why you chose that plan over other possible activities.
2. How did the activity go? Describe the actual activity and reflect on how it went.
3. What would I change?
4. What theories helped?
You might want to reverse the last two points to talk about the theories first and then reflect on how you might change the activity. This could involve talking about how you could apply a deeper understanding of the theories after having practiced doing an activity with a patient.