For two people we have managed to go a full two weeks in a CF-40 fridge. It was a bit tricky at the beginning, we ate like kings for the first few days to make more room for drinkies. Afterwards we thought we wouldnt mind just a little more, so got CFX50. Havent pushed it to its limits since we got it though.
UHT milk poppers are a good option to save fridge space.
Always go with beer cans, so much better inside the fridge and then of course great to take home afterwards due to them collapsing down. Seems like everyday there are more brands doing beer cans. So you're not really sacrificing too much on choice by going can.
Pour it into a unbreakable glass and it's just like the beer you get in pubs that dont allow glass...!