Slow down. Strenuous activities should be reduced,
eliminated, or rescheduled to the coolest time of the day.
Drink plenty of water or other non-alcoholic fluids.
Your body needs water to keep cool. Drink fluids even if
you don't feel thirsty. Persons who have epilepsy or heart,
kidney, or liver disease or are on fluid restrictive diets
or have problems with fluid retention should consult a physician
before increasing their consumption of fluids.
Again...do not drink alcoholic beverages.
Individuals should stay in the coolest available place,
not necessarily indoors. If your home does not have air
conditioning, go to a public facility with air conditioning, such as
a shopping mall or the local public library. Even a few hours spent
in air conditioning can help your body stay cooler when you go back into the heat.
Also, taking a cool shower or bath can help you cool off.
Don't get too much sun. Sunburn makes the job of
heat dissipation much more difficult.
Never leave any person or pet unattended for any length
of time in a car. A closed car can heat up to well over
one hundred degrees in a very short period. Even with the windows cracked open,
interior temperatures can rise almost 20 degrees Fahrenheit within the first 10 minutes.
www.weather.gov 
