Yes, of course we need to stay hydrated and make sure we have a good balance of salts and nutrition. People that are losing liquids, either from illness or intense exercise need to replace them. Pre- LC I did bike races and an important part of that is hydration/electrolytes and getting enough simple and complex carbs to finish. Bike shops have some pretty good electrolytes (mix of sugars and salts) that are less expensive then some of the grocery store and online stuff. Some of the online hydration sells are just overpriced sugar/salt (sucrose/NaCl) and water. I drink water with electrolytes if I'm biking, but not everyday unless my collitis causes fluid loss.