Every animal on Earth needs water to live, and that is especially true of humans. Depending on your height and weight, you could need more water than the average amount, but every person needs to focus on their daily water intake because dehydration causes cellular breakdown in the body.
The problem isn’t that you don’t understand you need more water, but trying to find time and circumstances to get your daily recommended amount. Here are some different ways to ensure you get plenty of water every day.