I do this often with these- https://www.amazon.com/American-Oak-Infusion-Spirals-Medium/dp/B0064OBE74/ref=sr_1_2?s=industrial&ie=UTF8&qid=1503619110&sr=1-2&keywords=oak+spirals I use about a 3" piece in a 2-liter glass bottle. It only adds oak flavor, color, and maybe some other wood like characteristics i.e., cinnamon. I got my spirals and glass bottles from Midwest Supplies.