Cool off as summer heats up or winds down by enjoying a delicious yet healthy frozen smoothie. This smoothie supplies all the vitamin C that you need for the day as well as various other antioxidants to keep you healthy and smiling after a day in the sun. If it is too tart, reduce the amount of lemon juice. Lemon juice helps quench thirst and combats dry mouth by increasing saliva production, making you feel cooler and more satisfied. Anything with citrus is a great choice for someone with a medical condition that requires a fluid restriction. You can drink less to quench your thirst.