One of the best products out there is the Somerset shaving oil: One little bottle will last you a whole det, it takes hardly any room and gives a really good shave even with little water. Worth a try before you go, as some chaps don't get on with it.
Perhaps take 2 as the jerboas ate my first one!
http://www.somersets.com/products_shavingoils.php
I am sure I will get banter for this, but have you thought about a pillow? If you are going to be based in the same accomodation and not in the field, then a pillow makes a massive difference to your quality of rest. You can get travel ones that pack up small, but some lads brought out big ones!! Perhaps you can buy them there now. Worth a thought, however there is no need for scatter cushions unless you are Sqn Ldr or higher.