You wouldn't dream of settling onto your beach towel without something to quench your thirst. But if you've decided not to lug the cooler, your drink is hot by the time you take your first gulp. To ensure Arctic-cold sipping all summer long, keep plastic bottles of water in the freezer (leaving a little room at the top for the ice to expand). On your way out the door in the morning, grab a frozen bottle and toss it in your bag. You'll be the coolest one on the beach.