Also, if you’re partial to using oil instead of candles you can get floating wicks and do the same thing:
Pre-Assembled Round Floating Wicks - 50 Count (Approx.), Cotton Wicks and Cork Disc Holders for Oil Cups https://amazon.com/dp/B0776DBJM4
Depending on the size of the cup just make sure you put in a bunch of water and only like a centimeter or so of oil (or less). Even that amount will burn for a while.