Can anyone give me any diet ideas???

My friend and I are having a bet to see who can lose the most weight before October. The only rules are these: No starving, no making yourself sick, no diet pills, no taking the other's diet plan, and no Special K. I need something fast, but not the grapefruit diet because that was her idea. I HAVE to win this bet, so please help me if you have any ideas!!!!!!! Thx