Weight Loss
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I noticed alot of people on here drink around 4 litres of water a day.  Why so much???  The recommended amount is 8 8oz glasses; 4 litres doubles that.  Please fill me in folks!!!
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I drink maybe 2-3 L. per day. For me, it does seem to fill me up and make me not as hungry. Helps me get through the afternoon without heavy snacking. Also, I will guzzle down a cup or two before we go out to eat. Plus , it's excellent for your skin , digestive track, and kidneys/bladder.
I actually drink between 4 and 5 liters per day, more if I am really active. The recomended 8- 8 oz isn't enough for everybody. How much you weigh, where you live, how active you are dictates how much you need. Someone here posted a calculator a while back that calculates how much your body needs. I have lost the link. Did anyone save it?

This site has a good write up in the Library section explaining why being properly hydrated is important. Its easier to understand than a lot of other writings I have found. You can find it here: http://www.calorie-count.com/calories/article /water.html
There are a whole bunch of threads going on about this right now. Generally for a rough measurement you can take your body weight divide it in half and that is how many ounces you should drink per day.

If you think about it, there is no way that a 260 lb man and a 120 lb woman should be drinking the same amount of water.

8 8-oz glasses is a good place to start (since most of us don't even drink that much)... once you know you can handle that, then you can get into the rough measurements and using the calculators.

Most calculators for me estimate that I should be drinking between 3 and 3.5 L of water per day. So I've settled on 3L as it is a manageable number.
I'm in the opposite camp.  I drink when I'm thirsty and don't worry about it the rest of the time.  Check out the article on 8 glasses a day at Snopes.com  It's very amusing as well as informative.  (Snopes is a site that specializes in debunking urban myths)

Also, for those of us who eat when bored *raises her hand* or to stay awake, drinking water is a good way of replacing the bad habit.  Zero cals and it can't hurt you.  Or rather, it can, but it's terribly terribly unlikely.  Just my two cents.
I try to drink 2 liters at work and think I'm doing well to do that. Frankly, going to the bathroom is boring, and I am not interested in having to go any more than necessary! :-D
Here's the link to the Snopes thread http://www.snopes.com/medical/myths/8glasses. asp

My cardiologist (two of them actually) says that 2 liters is more than enough to replace what you've used.

I've tried curbing hunger with water but it doesn't work for me.
water doesn't curb my hunger either... I think it may be because I've always drank a lot of water. If I drink a different beverage though, it fills me up (granted there are calories in other beverages though).
With the increasing summer heat, water is important to staying hydrated and aiding in meeting weight loss goals.

A good estimate is to take your body weight in pounds and divide that number in half. That gives you the number of ounces of water per day that you need to drink. For example, if you weigh 160 pounds, you should drink at least 80 ounces of water per day. If you exercise you should drink another 8 ounce glass of water for every 20 minutes you are active. If you drink coffee or alcohol, you should drink at least an equal amount of water. If you live in an arid climate, you should add another 2 servings per day. As you can see, your daily need for water can add up to quite a lot.

A calculator to help you figure out how much water you should drink:

http://www.muscletech.com/CALCULATORS/WATER/W ater_Calculator .shtml

Do you walk or run and want to know how much water to carry with you: Check out this calculator: http://walking.about.com/library/cal/ucwaterc alc.htm

Can you drink too much water? http://www.drmirkin.com/fitness/hyponatremia. html
Oh gosh I just chugged down sixteen ounces of water.  According to the water calculater I am supposed to drink 8 sixteen ounce bottles.  I have only been drinking 4.  So I will drink 8 and watch the weight just fall off my body. wish wish wish. lol
i read somewhere that if you exercise, you are supposed to drink the number of calories you burned in milliliters. so if you go out and burn 250 cals, make sure you slurp down an extra 250 ml (8 oz)
I try to drink at least 4 or 5 liters of water a day. I work out every day for about 2 hrs, so I do need lots of water. I even have days when I'm so thirsty that I have to have 7 liters of water. I also noticed that I am lighter the next day...

And if you're getting lots of fiber in your diet, you need lots of water to speed up your metabolism.

Water is soooo good for you... ;) Drink on (not more than 10 liters a day though)..
I probably drink about 80 oz a day.  I think that about 10 glasses or so.  I am trying to get my boyfriend to stop drinking caffine and try and drink more water but he says it hurts his stomach.  Does anyone have that - water makes your stomach hurt?  Any suggestions?
I probably drink over 140 a day... *shrug* More when I exercise :)
water hurts my stomach when i drink it too fast... or when i drink right before running. haha
I know there is that thing that says drink really cold water and you'll burn more calories but a dr told me yeah it'll burn calories but it's really not the best way to go about it, go for room temp or semi cold and you can totally chug it down without your stomach hurting
Climate also makes a difference. A person outside in 90 weather is going to loose a lot more water than a person outside in 50 weather.

A lot of things have to be taken into account. Temperature, activity level (obviously somebody working construction on a hot summer day needs more water than somebody sitting at a desk in an airconditioned office), body size, salt intake , general state of health.

When I was pregnant with my son and had bladder kidney infections my ob/gyn prescribed a minimum of a gallon of water a day to keep my urine going and flush out my system. I had a hard time drinking that much at the time (severe hyperemesis), and ended up in the hospital with among other things severe dehydration, in part because I got so sick I couldn't even keep water in me.

Every system in the human body requires water to function. A person can live weeks without eating, but barely a few days with out moisture.

The rules above are a goood guideline. But the best way to make sure you have enough fluid is to check your urine, if it is pale yellow practically clear you are getting enough water, if if is bright yellow (assuming you aren' taking b vitamins), you need more water. If it looks like apple juice, you need to see a doctor.

I usually drink a minimum of 3-5 liters a day, depending on what I'm doing that day. I talk for a living, so I probably need more than many office workers. 

While it is possible to drink too much water (water intoxication), it is not very common and ususally involves marathon runners who are water loading, or frat pledges being forced to drink large amounts of water. Most people usually know when they need to stop as thier body will tell them, enough.
I drink 100+ oz a day.  Today, for example, I had 120.  It keeps me from snacking, fills me up, and washes impurities and extra sodium out of the body.  Believe it or not, drinking lots of water, especially if you don't eat lots of sodium, will actually reduce bloating or water retention. 
Don't forget that the water in food counts as water, too, though. Do you make your morning oatmeal with water? Well, although some of it evaporates, more ends up in your system! Do you eat lettuce? It's only 2 cals/leaf because it's mostly water!

Personally, I'm also in the "I drink when I'm thirsty" camp--works fine for me.
I typically drink about 3L of water a day. I'm always thirsty. Plus I work with kids so we do a lot of playing kickball/dodgeball/etc and sit by the pool in the heat while they swim.

Please ensure that you intake enough Sodium in a day, remembering that if you dilute the sodium content of your blood too much it can cause problems with concentration, balance, it can cause cardiac arrhythmias. When exercising it is recommended to restore electrolytes as well as hydrating; make sure that you drink something along the lines of powerade/gatorade and such like. 

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