bigdigraz: everyone here is giving you good advice and they are only looking out for you.
But to everyone commenting here, has anyone ran the numbers? If the OP started today and worked hard and consistent to lose 1% of his body weight per week, even if you accounted for his weight going down and factoring that into the 1% calculation, the op should be able to healthily lose 93lbs between 26 and 27 weeks, which is 182-189 days. Don't forget that on average, a month is going to be about 30days, and not 4 weeks, so that puts him reaching his goal in 6.067 to 6.3 months, which is ONLY 2 to 9 days over his month deadline. Strictly by the numbers, at the 6 month mark, he should be within 3-6 lbs of his 93lb loss goal. If you account for the fact that he will probably dump an extra 3-6 lbs at least of water weight the first month, you start to realize that this is not just an achievable goal, but one that can be achieved in the healthy recommended manner this site recommends.
Now, this would require a big committment, and would be very hard to do, but I don't see that it is unhealthy, at least not according to the general consensus of everything I have learned from this site. I don't think I would have been able to do it just starting out. I did lose 150lbs from a starting weight of over 475 in a year, and even that would have fell short of 93lbs in 6 months. On the other hand, if the OP finds himself falling behind his target and starts taking drastic measures to keep up, then it does become unhealthy. That is not the issue right now. I understand the rush to judge because he is choosing to lose weight for a less than ideal motivating factor (the bet), but there's no reason he can't learn to live healthier throughout the next 6 months, and still win his bet.
bigdigraz, good luck on achieving your goal!