[Coffee.]

Well, I would confide in a friend about your eating disorder, and go shopping with her. She can help you buy what you need, without buying the triggering comfort foods, and help you stay healthy.
There are also many coping mechanisms to keep yourself calm during an urge to binge and purge. Ground yourself: Count to ten up and down, do some breathing exercises. Realize you're here now, and you're going to make the right decision, and everything will be alright. There are more in a new post I'm starting, about different ways of coping with Eating Disorder urges! You should check it out. You can add to it, or get ideas from others suffering as well.
http://www.teenhelp.org/forums/f15-e...ing-disorders/