There are always a lot of questions as to what qualifies as a shelter in the Frozen Otter. I simply define it as something that is large enough to accommodate you and still keep out the rain/snow and wind.
This could be a full blown tent, or a simple tarp with means to pitch it. Remember that you will probably already be carrying trekking poles which could be used, and a length of rope does not weigh a ton.
A basic first aid kit is fine. I suggest at the very least that it contain an ace bandage, pain killers, bandages, medical tape, and anti-inflamatories. It is possible that the gear list will be updated prior to the event with more specifics. In that case, the requirements as specified in the gear list take precedence over this post.