What are some everyday activities that I can do to help combat depression?

The best activities to do are that ones that you are able to do, and that you enjoy (or at least used to enjoy) doing. Depression can rob us of the energy, motivation, and joy of doing things, so I recognize that a lot of activities might not be as appealing to you at the moment. Having said that, it is a very good sign that you are looking to introduce more activities into your daily life, that might help your healing process immensely! My advice would be introduce physical activities, as this will help your mood on a brain level; this can be as simple as taking a daily 30min walk. Also, why not try drawing or painting? Art can be very therapeutic and calming; try to use as many bright colours as you can get your hands on. Another activity that might help is reading quality literature. Depression can sometimes mess with your ability to concentrate, but if you are able to concentrate on reading books, even if for much shorter periods of time, that could be really helpful; reading can immerse you into a different world, shifting your thoughts to something other than your current situation. Last but not least, if you are not doing it already, start journaling (regularly!); keeping a diary will give you an outlet to vent your feelings, and might get you to better analyze the events in your life and your thoughts about them.