We pride ourselves in being self-sufficient in the field- we don't want to have to rely on re-supply to get our work done. As a result, we usually end up packing 7 or more weeks worth of food before we head out onto the ice. the stockroom in McMurdo has a great selection, and we basically can eat anything we want, as long as it can be frozen. However, convenience is important too, so we often concentrate on food that is easy to prepare and packs in the calories. Chocolate comes to mind in this regard.