You've heard it all, drink 8 cups per day, drink 1/2 your body weight in ounces etc. Those recommendations don't count the water you get from solid food.
20% of your daily hydration comes from food. So it's good to make it count.
A good rule of thumb is 1/2 your body weight in ounces of water daily. If you struggle with drinking the necessary water, try eating more of your water by eating some of these - they all contain 90% or greater water content. BONUS, they won't make you fat like cake will either.