The elderly and small babies are most vulnerable to the dangers of hot weather. Know the warning signs of heat exhaustion and heat stroke. Bring the person affected into a cooler, shaded, or air conditioned area and give them time to cool down. Symptoms may include hot, dry skin, shallow breathing, a racing pulse and total disorientation. Drink more fluids than normal.
Water still works best.
Salt tablets probably aren't needed, but eating citrus fruits will help to replace lost potassium. Most people find that their comfort level increases if they cut down their consumption of meats, eating more salads instead. Avoid the midday sun. Use a highly protective sunscreen. A severe sunburn will leave you feeling a lot worse.