Everybody should have an emergency kit with them at all times.  You need to have first aid equipment for injuries, food and water, and the like.  You should also have a change of clothes and of course a towel.  Why a towel?  There are so many reasons.  You can wrap up a broken arm, or use it for shelter from the heat of the sun or the cold of night.  You can twist it up and use it as a whip, or just filter water to drink.  A towel is real important.