My doctor recommended 8 glasses of water daily at least, of which 2 glasses are with electrolytes in addition to adding more fiber. I usually have a smoothie daily for lunch and add 2 TBS of chia seeds - great fiber addition. For electrolytes, she recommended Quentin Hypertonic Sea Water - 2 tbs. followed by drinking a glass of water (tastes like salty water) which can be purchased on Amazon. And find an electrolyte flavored powder you can add to the 2nd glass of water.
If you exercise and sweat or live in a warm/hot climate where you sweat or in a cold climate as well as our bodies need alot of water to keep us warm, you need electrolytes plus additional fluid.