Step 1: Things You'll Need
-Pliers (with wire cutting bit)
-A spare USB cable
-Some lights/LEDS, Mine were acquired from an Ikea light set that runs on four AA batteries (these cost a pound and have a great battery holder with switch and wires for projects.) You'll see in the picture that mine has dim lights and a really bright one, I took the end bulb out of the circuit to make it like that.
Step 2: Making the Connection
Strip a good bit of insulation from your pairing wires, bring them alongside eachother and twist the strands into eachother until they're tight, now fold the twisted part over and twist this, that ensures a good connection and it's very strong compared to a few twists and a bit of tape.
Again I'd like to apologize for the poor quality of my photos, I really miss my camera, You'll notice that my how to talk to an ex instructable has odd photos I pulled from my 'stock' of photos on my computer (thanks to messing with the camera and being a bit of photographer it made it easy enough) But I hate phone cameras for this reason (look down)
Step 3: Feed the String of Lights Into the Bottle
Things that would make this really good are, a glass cutting drill bit, Some kind of oil (mineral oil maybe that is a similar colour to beer and non conductive and considering that bottle is twist top I'd be happy enough.