PHILADELPHIA - There are many ways to stay cool during a heat wave. Follow these tips to keep yourself, your pets, and your elderly relatives safe. You should also avoid leaving your children and elderly relatives unattended in a car or near water. Try to limit outdoor activities during hot weather and apply sunscreen frequently. Children and elderly people should dress in loose, lightweight clothing and be encouraged to drink plenty of water. Sugary or alcoholic beverages can make dehydration worse.