Question

How can you quickly hydrate your body without a IV? Update: how do you know if you are seriously dehydrated>

Answer 1

drink pedialite or anything with electrolites, and you would know because your mouth is dry and you're very thirsty, also a common sign of dehydration is head aches.

Answer 2

I believe that the fastest way to hydrate your body is by drinking plenty of water throughout the day and specially if you plan on doing any kind of sport activity that very same day. You could also drink sport drinks that have electrolites.

I hope it helps, Regards.