My sister and brother-in-law had planned a week of camping at Lac-Mégantic, a stunning lake in Quebec’s Eastern Townships. It was an easy four-hour drive from their home in New Hampshire, so they loaded up the SUV with camping gear and a cooler filled with enough food for the week. They’re both vegetarians, which meant plenty of fresh fruit and vegetables. Passports in hand, campsite booked, cooler packed. What could possibly go wrong? Apparently, the blueberries. When it was