I dunno, must I explain everything? You get thin strips of crispy-fried (smoky if preferred) bacon. You place them in fine muslin and insert them into the vodka, leaving a pull of muslin over the top of the bottle. The muslin stops the bacon disintegrating into the alcohol. After two weeks, you pull the muslin carefully out of the bottle, and there you have it.
In Saudi, we used to put oak chips into the 'sadiqi' (white lightning) for about 3 weeks, to mellow and turn the alcolhol to what was brilliantly called 'brown'. The flavour was fabulous - like Maker's Mark or similar. We also made Cointreau by setting a whole orange about 2" above an open bottle of sadiqi, in a dark cupboard. The orange slowly wizened and its oils and aroma went into the bottle. It took time, of course, but the result was deeelicious. You can use vodka just like white lightning because, neither having a strong flavour of their own, they will take on the flavour of whatever you introduce to them.