One of the keys to effortless entertaining is preparation. But it isn't always practical to keep your pantry stocked with perishable goods on the off chance your doorbell might ring with unexpected guests. A simple and elegant way to master the art of the "drop by" is to keep 2-3 bottles of Pellegrino sparkling water on hand (at least 1 unopened bottle chilling in the fridge at all times), along with a bag of frozen whole cranberries in the freezer. When the doorbell rings, it's as simple as opening the chilled bottle, adding a few frozen rubies along with a few regular ice cubes into a stemless wine glass and serve. Unprepared for visitors? Not you... you're a domestic goddess. Stylish, and effortlessly elegant - no matter what time of day or who it is that stops by.