I don't really know how I function when depressed. Not very well.
Somehow I can usually force myself to go to work and I am so busy at work I don't have time to think of how miserable I am. But I definitely am just surviving, not really living. Even showering and basic hygiene can become too hard at times.

When stuck in a low mood I tend to treat my life how doctors do triage, treating the life threatening injuries first. I only keep up with only those task that I absolutely must do so I can keep my job and pay rent and eat. Everything else takes a backseat and doesn't get done, until my mood climbs back up and i get energy and motivation to do all of those chores and things I couldn't handle while down. It's a pretty crappy system of survival but I suppose it works, as I have been at the same job for over 10 years and manage to keep me and my cats alive in our own place. Idk. I like the idea of breaking up tasks into parts.

Try to be gentle with yourself when depressed. My not being able to function well enough to accomplish daily chores is hard enough; also mentally berating myself for it and for being such a fuccking failure at life just makes things that much worse. Celebrate even small accomplishments. There have been times when just doing my laundry has felt like more of a feat than getting my masters did... hang in there.