8 glasses.The recommendation for all adults is to drink a minimum of 8 glasses, or 64 ounces, of water every day. This is the absolute minimum that you should drink, and that number may be higher depending on your weight, activity level, and even the weather outside. For example, if it is an extremely hot day and you are spending a lot of time outdoors, you should drink a lot more water than you would drink on a cooler day or on days you spend inside.
Additionally, if you are exercising or doing another activity that causes you to sweat, you should try to drink more water. Sweat is your body’s way of keeping cool, but it does expel water from the body. This means you need to drink more water to replace what is used. So, always drink 8 glasses a day, and if you’re sweating, drink even more!