Soft metal cork-cap on the bottle with vegetable oil after opening, is usually vented, and the usual on the slippery bottle to use uncomfortable, and the hosts often do not clog the bottle, which is not very hygienic. Take a standard tube and with a sharp knife or blade cut at its side surface a groove. Get a kind of “dropper”, which not need every time to open the bottle to pour oil salad: it will now penetrate through the groove — more intense than it is wider.