To calculate your daily water requirement, simply take your weight, in pounds, and divide it by two. That’s how many ounces of water you should drink each day.

For example, if you weigh 160 pounds, drink 80 ounces of water daily.

A cup of water contains about 8 ounces, but sizes vary. To learn how to eyeball the right amount, pour 8 ounces of water into a measuring cup, and then pour it into a cup or glass you routinely use.

And then calculate how many of those you need to drink to reach your daily quota.

Or get a glass water bottle that holds a specific amount and use it as your guide.