Bottle stoppers can generally be purchased at a range of stores. These include supermarkets, corner shops, and the slightly higher-end of wine stores and off licenses.
to avoid contaminating the chemical when the stopper is replaced
A CORK stopper is a plug for a bottle made of cork
Grease the top of the bottle!
Cork
With a few exceptions (notably melting ice) objects expand when heated. If you run hot water on a bottle neck, the heat is applied directly to the bottle and only indirectly to the stopper inside the bottle, so the bottle heats first, and thereby expands sooner than the stopper does. An expanded bottle will exert less pressure on the stopper.
Increasing the pressure on the stopper in a bottle of water will compress the air inside, which in turn increases the pressure. This will cause the pressure inside the bottle to rise. Conversely, releasing the stopper will decrease the pressure inside the bottle as the air expands.
The reagent bottle is not used for dropping, having only a common stopper.
To make a potion bottle, you can start by finding a glass bottle with a cork or stopper. Clean the bottle thoroughly and let it dry. Then, you can decorate the bottle with symbols or labels to make it look like a potion bottle. Fill the bottle with colored liquid or glitter for a magical effect. Finally, seal the bottle with the cork or stopper securely.
all you have to do is take the bottle to mars and ask the aliens to open it for you> yeah don't listen to that idiot> you just use pliars to carefully remove the stopper
Decanter
If you press the stopper down farther, the volume inside the bottle decreases. As a result, the pressure inside the bottle increases because the gas particles inside the bottle are now more compressed due to the reduced volume.
If you are thinking about a 'wine professional' then a Sommelier