【How-to】How did gus know about the bomb

Jesse, Mike, and Gus are brought to the hacienda of Don Eladio Vuente, where Gus and Eladio make peace, capped off with a bottle of rare tequila from Gus. As Eladio and his henchmen party, Gus goes to the bathroom calmly and induces himself to vomit – the tequila was poisoned, and everyone who drank it collapses.