In reply to Owen W-G:
I tried to go for things that you only need to add hot water too, to save washing up. In contrast to the guy who took a frying pan and had a greasy fry up every breakfast and dinner for as long as his suppy of steak, sausage and bacon lasted! To be fair he never actually cleaned the frying pan.
With cous cous you can just add water in the bowl. Bags of microwave pasta and rice also boil in the bag very well, same with sachets of pasta sauce, stir fry sauce etc. Just boil it all in their bags and chuck it in a bowl with veg and cooked meat etc, no sticky pans to clean.
For milk a mate and I took a few 1 litre cartons of UHT each and shared them. A litre only lasts about 2 days with 2 people having cereal and tea/coffee. Once open it will keep for that time if kept in the shade, or in a bucket of water.
Spade for toileting. Someone mentioned above about going below the high tide line. As far as our group understood it, and the group before us, you go below the high tide line but you still dig it a shallow grave.
For comfort make sure someone in the group takes a big tent that everyone can fit in, good for when the weather is grim and much more sociable than sitting in your own tent. I also took a 3 man tent for myself, much better than trying to squeeze into a small tent with all your kit for a week.
Take a reliable stove and test it beforehand. Many hours of entertainment were had watching one of the guys dismantle and attempt to fix his ancient MSR multi fuel stove, in the rain, for about 3 days. We did lend him a stove, but he still insisted on trying to fix his.