An infinity bottle is a personalized, ever-changing blend of spirits—most commonly whiskey. Fill it with your favorite liquors, and continually "top it off" with new additions as you drink from it, so the bottle never actually runs dry. 
 
The Core Concept
The Rules are Up to You: There is no strict recipe. You can drop the last 1–2 ounces of different bottles into it to save space, or carefully measure specific ratios of similar flavor profiles to become your own master blender.
The "Infinity" Factor: As you take a pour out and add a pour in, the flavor profile of the bottle continually evolves over time.
Customization:
 It results in a highly unique, one-of-a-kind blend that nobody else can replicate.