"Every day is an anxiety in my ways of getting to the water. . . . I've become so attuned to it, so scared of it, so in love with it that sometimes I can only think by the sea. It is the only place I feel at home." Many of us visit the sea. Admire it. Even profess to love it. But very few of us live it. Philip Hoare does. He swims in the sea every day, either off the coast of his native Southampton or his adopted Cape Cod. He watches...