Help please! is drinking 3 glasses of water a day too little?

Most likely: On average, the average adult should drink between 8-10 eight ounce glasses of water daily. 8 ounces equals one household measuring cup size. Your fluid intake also comes from your foods, especially fresh fruit and vegetables. Also other beverages have water content that will contribute to your daily intake value. You can monitor your hydration by the color of your urine, which should light yellow.