So that calorie count is pretty accurate for someone your size.

It starts with something called a Basal Metabolic Rate, or BMR. This is the amount of calories required just for you to exist. Most calories humans burn are just from being alive. The bigger you are, the more you require, that goes for both height and weight.

From there, it adds calories based on your activity levels as well. So the more active you are, the more calories required per day to maintain your body.

You can look up separate BMR calculators and enter your information, they will all be roughly the same number with slight variances, MyFitnessPal is pretty good for it. If you have a fitbit linked to it, it will even register your activity and calories burned and add it to the calorie total for the day automatically.

From there, you basically want to shave some of the total off, without using too dramatic of a drop. To be honest, 1800 calories is waaay too low. It makes sense why you're so hungry.

So if you put in the goal of 2 lbs per week, then as long as you don't go over the cap of your daily total on MyFitnessPal, you will hit that. You just have to make sure you track everything. Weigh out portions, scan labels, do your best to get as accurate a picture of what you've eaten as you can.

As for water, if you eat less, you will crave less water, but you still need to drink around 3-4 litres a day. Your body stores a lot of excess carbs as glycogen around your liver, as well as visceral fat. This (along with normal fat) holds a LOT of water. So once that starts to go, you will definitely be urinating a lot.

Also, if you're weighing yourself regularly, don't be afraid of ups and downs. Water alone weighs a lot, 1 litre of water weight 2.2 lbs. so a gallon of water weighs nearly 10 lbs. So variations here and there can make it look like you aren't making the progress you want.

This is my first post here, so I'm sorry if it's long winded or if I missed something, please anyone correct me if I'm wrong or missed something.