The key is to catch dehydration before it starts having negative health effects. When you start getting thirsty, it means you are already dehydrated, so start drinking water right away as soon as your body tells you it is thirsty.
Drinks containing sugar, alcohol, and caffeine can actually dehydrate you even more, so make sure you don’t reach for a soda or a beer instead of giving your cells the hydration it is actually craving. It also gets rid of feelings of hunger and cuts the cravings for junk foods. Here are some extremely important health facts about hydration and why drinking more water each day (preferably 2-3 liters) can save your health:
Source: Spirit Science and Metaphysics