Good Cook 3-Piece Plastic Funnel Set (Pack of 6)

The smallest one is great for small-necked bottles, such as tincture bottles for holistic medicines. I use them just about every day. They're also dishwasher safe, and very durable. I threw one at my wall a few times just to see how durable they were, and it didn't chip or crack, so they're made to last! I really like how they seat in the bottle necks, too. They lean naturally toward the front, so they get a nice air seal, and won't easily fall out like other brands. I took a photo to give you an idea of how wide the bottoms are. The smallest one is about 1/4".