Water is the lifeblood in the parched San Joaquin Valley, sustaining endless acres of trees, seeds and pastures that feed a hungry nation. But a controversial pipeline sits empty, as dry as dust, caught in an angry feud between two of California’s largest land barons, Silicon Valley developer and farmer John Vidovich and Pasadena-based longtime cotton king J.G. Boswell Company. Vidovich needs the pipe to move water. The Boswell Company wants it blocked, saying it threatens the company’s own water supplies, which run through a canal over the pipeline’s underground route.