I can’t resist packing my pockets with acorns. In past years I’ve leached the tannins out in the toilet tank then made meal. It’s edible but just barely. This year I opted for tiny candles.
Remove the cap, nestle in sand, fill with melted wax then add wick. ( I used cotton string and it worked well.)
These should only be lit floating in water as the cap can catch on fire!