This time of year, shoppers who set foot inside Lowe’s Market in downtown Canyon Lake, are usually looking for two things: swimming gear and beer. The cramped and busy grocery store, which is located about an hour north of San Antonio and whose wide selection of disparate items gives it the feel of a mini-Walmart, is often the last stop for supplies before locals and tourists float down the nearby Guadalupe River, a Texas summer tradition. But for the last two weeks, something else has lured an endless stream of outdoor enthusiasts, ranchers, gun lovers, and tourists into the store, often with looks of excitement and curiosity splashed across their faces. It’s not the fresh produce, the sunscreen, or even the generous selection of wine and…