Micro Dwelling sketches!

Having started the Micro dwelling project I personally encountered a problem. How can I decide what amenities are essential in order for my design to be self sufficient yet minimal?
I also had to design things according to the standard measurements of circulation space in living, kitchen and bathroom areas. It has been an interesting project so far. I have still to decide where in the wrold are my designs going to be, but I think that once I have the 3D models of my sketches it would be a lot easier to see...

Here are my preliminary sketches, Enjoy!