Summertime means swimming, camping and other outdoor adventures. But even these carefree activities can send you home with their own “souvenirs.” From twisted ankles to poison ivy and jellyfish stings, many minor first aid incidents can be treated on the spot. (But remember: Every situation is different, so use your best judgment as to whether you or the person you’re treating needs further care or medical attention.) Have fun this summer and be prepared for anything: Here are 12 common first aid emergencies and how you should respond.