I love this thread.
I don't love the idea of powdered milk.
I love the USB fridge.
I've actually got a lifeventure mug, and usually use that to transport a first coffee for the day that I make at home with my hipster stove top espresso machine (I'm not quite hipster enough to have a full-on barista machine...). I guess I could just get another.
The little shop on site occasionally sells 250ml milk cartons (I've got one today) but I've had that smelling distinctly 'odd' by the end of the day (our office gets unbearably warm), plus it's more milk than I need, so a lot goes to waste.
Fridge has been asked for in the past. I think the issue is very like in a previous large organisation - they want people to use the canteen, so want to discourage personal food choices (same reason for there not being a microwave - I still fight the system by bringing in my own lunches that don't need reheated).