You need these clear ornaments, I'm pretty sure you can find them at any craft store.
First you need to pull the top off. You just gently pull the ring.
Pour a lot of polish into the ornament. Then swirl it around to completely coat the inside.
Then pour the remaining polish back into the bottle. Just hold it and let it drip out until it's out, or your arm gets tired or you get bored.
When I didn't want to hold them anymore, I put them in an empty egg carton- opening down so the polish could keep dripping out. You could stick a paper towel in a cup/jar and do it that way too