why is hydration so important?
Water is very good for you because it helps to keep you hydrated.  Your body needs water for nearly every function.  When you are well hydrated you will look younger because your skin has better elasticity.  You can think more clearly because your brain is hydrated.  You muscles will recover faster, and you will have better digestion.  Coffee and sugar drinks will dehydrate you so if you have some of these make sure you replenish your fluids with more water to get hydrated.
Instruction: why is hydration so important?
Context: 
Response: Water is very good for you because it helps to keep you hydrated.  Your body needs water for nearly every function.  When you are well hydrated you will look younger because your skin has better elasticity.  You can think more clearly because your brain is hydrated.  You muscles will recover faster, and you will have better digestion.  Coffee and sugar drinks will dehydrate you so if you have some of these make sure you replenish your fluids with more water to get hydrated.