What is a simple test you can administer to tell if you are dehydrated?
You can spit... then see if your spit is bubbly or clear. The
more bubbly it is, the more dehydrated you are.
Of course, if you feel thirsty it is a clear sign you are
already dehydrated.
If you start to feel weak, you start to feel dizzy, your throat
feels dry. Lastly when someone hands you a Gatorade or water you
gulp that thing down like you never drank before. Trust me this
happened to me when I played softball it was in the high 80s, it
was my turn to bat I felt so weak I couldn't hold the bat straight.
The coach lead me underneath a tree gave me a big water bottle I
was done when the next person was up to bat!