Being off the grid suits Kurt Vile just fine. Sitting on the wraparound porch in jeans and a green T-shirt he got at the Ramones Museum in Berlin, unruly curls falling well below his shoulders, the 38-year-old Philadelphia singer-guitarist squirts several drops of a tincture labeled “Calm Mind” into a plastic water bottle and gives it a thorough swish. “Ayurvedic herbs,” he explains after gulping down his concoction. “It’s like nature’s Xanax.” He doesn’t sound entirely convinced.