You need water to regulate body temperature and to provide the means for nutrients to travel to your organs and tissues. It also helps transport oxygen to your cells, removes waste, and protects your joints and organs. Taking in too litter water or losing too much water leads to dehydration. Symptoms of mild dehydration include thirst, pains in joints and muscles, lower back pain, headaches and constipation.
Water is probably the best choice for rehydration because it's inexpensive and has no calories or added ingredients. Tap and bottled was is often fluoridated, to help prevent tooth decay. Sweetened soft drinks and sodas have added sugar that adds extra calories but no additional nutritional value. Sports drinks contain minerals that may help keep your electrolytes in balance, which is good for recovering after a hard work out, but look out for added sugar and calories that you may not want. Fruit and vegetable juices can be a good choice because they have vitamins and minerals your body needs (read labels, however -- vegetable juices may be high in sodium). Caffeinated beverages like tea and coffee count too, but too much caffeine can make you feel jittery.
Drink pleanty of water during these hot summer month temperatures....