Almost forgot to post the answer.....
1. Oxygen - vital to support life
2. Water - second essential, to sustain life and to make eating
3. Map - third essential, to move in the right direction
4. Concentrated food - important, tho not so essential as water
5. Transmitter - important, for communication
6. Rope - important, to maintain movement as the gravity is low and moon's surface is full of cliffs
7. First Aid Kit - important
8. Parachute silk - important, it can be cutup and turned into packs to carry other objects, or laid out as a marker
9. Lift-raft - useful, life-raft contains a can of gas for inflation purpose, or it can be used as a propulsion unit
10. Flares - useful, to draw attention of rescuers, it also contains its own source of oxygen
11. Pistols - of little use, perhaps for propulsion purposes
12. Powdered milk - of little use
13. Heater - of no use, the daylight side of the moon is always warm
14. Compass - of no use, no magnetic poles on the moon
15. Matches - of no use, no oxygen
The order of the last few ones may be altered as they are of no use.