not trying to be a dick man but i'm actually going to post some stuff to help you because i feel bad for you. i honestly don't think you know what you are getting into. if you don't train mma what tma do you train? i am not trying to make fun of you...i am really curious...really hope for your sake it's bjj...muay thai..or at least jkd.
here are a couple of good links:
http://tinyurl.com/28vudd
www.grapplearts.com/How-to-Cut-Weight.html
below is from pro fighter Brian McLaughlin:
One week out from weigh-ins:
I cut my carbs (carbohydrates hold four times their weight in water) and only eat green vegetables for carbs.
I then Fiber load taking 3 tablespoons of Psyllium Husk (45 grams of fiber) daily. Fiber helps you store less waste in your digestive track and I've read that psyllium husk can actually make you pass fat in your stool.
5 days out from weigh-ins I hyperhydrate with 2 1/2 gallons of water for two days (I also increase my salt intake to about double my normal level), then 1 1/2 gallons the next day (at this point I restrict my salt as little as possible), then 1 gallon the next day, then no water (or food) whatsoever 24 hours from weigh-ins.
The idea is that hyperhydrating puts you in a natural diuretic state, by suddenly stopping your fluid intake you lose you water simply by going to the bathroom. Also, sodium makes you retain water, loading up and then cutting down means you keep your sodium levels low and retain very little water.
The night before the weigh-ins I usually take 1,000 mg of dandelion root (mild diuretic) and some senna tea (mild laxative).
The morning of the weigh-ins I usually have a cup of black coffee to help lose the last bit of water. If I am somehow still overweight I take a hot bath for about 20 minutes.
I NEVER get in a sauna or wear a rubber suit, I think anyone who does a substantial amount of heat exposure pre-weigh-in is either in the wrong weight class or did not do their homework on the proper way to make weight.
Post weigh-in I sip on pedialyte cut 2-1 with Smart water. I make sure I down at least 64 oz. of fluids before I eat anything since food slows down hydration.
I also load up on liquid vitamins since I've heard they have a better absorbtion rate and are easier on the stomach. I also take an electrolyte supplement which gives me extra potasium, sodium, iodine, calcium, b vitamins, vitamin c, and some other good stuff.
I then go to town on rice, pasta, bagels, fruits and any other low fiber high carb grain I can get my hands on. I then take a long nap and sleep in the next day to make sure I'm fully recovered.
This is the method I use for all my fights or major grappling events. My last fight I tipped the scales at 156 at weigh-ins and was 168 by fight time. I consider myself a decent size for 155 (below is a post-fight pic)