Drinking enough water, especially here in hot California, can't be over emphasized. Exercise depletes the body of valuable water. The hot weather and caffeinated beverages also diminish your bodies hydration. If your goal is to lose weight, drinking enough water is as essential as counting your calories.
How much water is enough? There isn't an exact science behind how much is enough. Growing up we probably heard that we should drink 8- eight ounce glasses a day. Even though that is a good start, there is no science behind why and how that amount came into being. The current thought though, especially if you are exercising and trying to lose body fat, is a simple formula.
Take your body weight in pounds and divide in half. The resulting number is the number of ounces you should consume in a day. For example, if you weigh 200 hundred pounds then you would need to drink 100 ounces per day.
Drinking that amount of water may sound like a lot, 120 ounces equals one gallon, but simple steps can make it a lot easier. Always have a bottle of water on your desk at work. Carry a bottle in your car. Have a glass of water when you wake up, possibly with any supplements that you may be taking. Drink a glass of water prior to going to bed. A little bit here and there can quickly add up to the amount that you need.
Start to record the number of ounces of water you drink on a daily basis in your food journal. At first you may not get enough, but with constant recording and feed back from your journal you will soon be where you need to be. You might find that some of that stubborn fat that you are trying to get rid of is falling off a little easier.