2 week on/2 week off schedule away from home

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I work a 2 week on/2 week off schedule away from home and living off camp food!! Any tips on how to avoid the not so healthy food line, and have any lunch ideas?? I can bring food from home but refrigeration/freezing and cooking is an issue, although I do have access to a microwave :) I desperatley need help on these 2 weeks