Your dream contains several significant symbols and themes that can provide insight into your current feelings and experiences.

1. Training and Coaching: Being part of or leading a training for a top-secret organization like the FBI suggests that you may be grappling with issues of responsibility, authority, or a desire to gain or share knowledge. It could indicate that you are preparing for a new challenge or role in your waking life, perhaps a new job or project that feels important.
2. Bitter Drink and Sweetening: The bitter drink represents challenges or unpleasant experiences that require you to find ways to make them more palatable. The choice between using sugar or Truvia may symbolize your awareness of health and well-being, particularly regarding the choices you make daily. Your concern about the high sugar content parallels your waking reality about managing your dietary habits.
3. The African American Woman and Her Son: Their reaction to the bitter drink reflects your own concerns regarding how others, especially loved ones, might perceive the challenges or choices you face. It may also point to feelings of responsibility to others when making decisions that affect your health or lifestyle.
4. Grandmother's Apartment and Bathroom: The switch to the scene with your grandmother’s apartment could represent a connection to your family roots or past. The bathroom symbolizes a place of privacy and personal needs—a space where you can refresh and cleanse yourself. The secret button to close the door indicates a desire for privacy or control over your personal space.
5. Photographing the Scene: Taking a photo of the living room and realizing it was misaligned can symbolize your perspective on life or your current situation. It may indicate that you are trying to capture moments or experiences but feel like you are missing something important. The second attempt with a wide-angle lens suggests a desire for a broader perspective and understanding of your life and relationships.

Overall, this dream reflects themes of responsibility, personal choices, family connections, and the need to find balance in your life. It could be beneficial to reflect on what areas in your life feel "bitter" and how you can sweeten those experiences without compromising your well-being. Consider how you can take control of your situation, like the secret button, to create the privacy and clarity you desire.