The conventional wisdom that we need 64 ounces of water a day gave rise to the 8x8 rule (8 cups of 8 ounces each). It’s bogus.
Your body has an amazing ability to adapt to too little or too much water intake, and a lot of the water you need comes from food.
Yes, you should stay well hydrated, this physician/writer advises, but you don’t need an adult sippy cup at the ready 24/7.
https://medium.com/wise-well/soaked-the-myths-and-facts-of-hydration-8e7f58324086