Water doesn't give you energy and doing a long walk without eating any food will do more damage than good =)
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go out for a bingeing session with a best friend. like at a buffet place or something where you can just sit and talk about your problems and all over food. thats what i do when my best friend was in that situation (: shes bulimic so i had to do it that way
Buy a bargin bucket, have it all to yourself.