Tips.
While relaxing, fidget. You'd be surprised how many calories you burn by fidgeting. Plus you're sitting down, you might as well.
Walk instead of driving, taking the elevator, etc.
Drink cold liquids and take cold showers. Your body will burn more calories trying to warm you up.
Go shopping, if you go to a mall and shop all day, you are walking all day which = exercise!
Cleaning occupies you and will burn calories as it can be a workout.
If you're hungry take a fiber supplement! I recommend Benefiber powder. 2 teaspoons to 4 ounces of water. You'll get your water you need (you can always add more than 4 ounces) and the fiber will move the food you've already eaten out of your body faster!
Brushing your teeth will make you less likely to eat as you won't want to ruin your fresh clean mouth.
Obviously all foods have calories, but there are some foods that use up more calories through digestion than they contain. Go to http://www.negativecaloriefoods.com/ for a list of these foods.
Keep a food diary. Write down everything you eat and anything else you feel might be helpful to know. This will allow you to measure progress and track patterns over time.
Spend a little time every day on pro-anorexic sites or doing something completely and totally thinspirational. This totally works for me.
If you're using laxatives, be sure to drink tons of water before (which is very important) and after.
Depriving yourself of food (or using laxatives) will deprive you of nutrients also. Take a multivitamin! I recommend One A Day All Day Energy.
Eat slowly! It only takes 20 minutes for your stomach to tell you it's full so take your time!
Exercise right when you wake up in the morning by doing 40-50 situps. You'll feel motivated for the rest of the day and it will raise your metabolism.
Don't punish yourself, reward yourself! Once a week, when you've done good, take a bubble bath or get a massage or a manicure to relax yourself and reward yourself for your hard work.
I love this one: practice picturing yourself thin. It will make you motivated and remind you that everything you're doing will be worth it.
If you've screwed up, stop eating when you realize it! It's better than saying "I'll do better tomorrow" and eating that 6th donut.
If you must eat what you crave (such as chocolate) just eat a fun size candy bar. Eat it slow and savor it.
If you have to cook chew gum so you won't eat any of it in the process.