Separate fridges?
Seriously, in the days when I lived in shared accomodation,the contents of the fridge, and the owners thereof, was a constant cause of friction
Until you've been woken up at 6 AM by some bereft trucker screaming "WHAT BASTARD STOLE MY EFFING MARMITE?" which he required for his morning toast. You ain't lived.
Definitely need some agreement on financial contributions. Everybody uses electricity, so everybody should pay for it. etc etc.