Place 1–2 bags of marbles in the bottom of your wine bottle. Small rocks work well too, just be sure you put something in the bottom of your bottle to keep it steady.
Wrap the 1/2-inch (wider) end of your coupling with teflon tape, so that it will fit snuggly into the mouth of the bottle. The idea is to wrap just a bit more than you’ll need, and you can press it down into place after you fill the bottle with torch fluid. Set the wrapped coupling in place but don’t press down firmly just yet.
Remove the wrapped coupling and slide the replacement wick through, leaving about 1/2″ of the wick sticking out of the top to light.
Place your funnel in the mouth of the bottle and carefully add your torch fluid. You don’t need a funnel for this step, but it drastically reduces the amount of torch fluid that spills on the outside of your bottle—and that is a major plus in my book! Be sure not to fill the bottle all the way so that when you place the wick inside, it won’t overflow.
Add your wick and press in on the teflon tape so the coupling makes a tight fit.