"The Thirst We Have" is about a day in the life of an embattled teacher. From dawn to bed time, Joe Monte dallies with his students, his colleagues, his wife, and his children. "Bob, Son of Battle: His Confessions" takes teacher Bob Stroonz through a school year to the summer where, in the Berkshires, he teaches literature to rich kids abandoned by their busy, indifferent parents. Things don't go well.