Poura Oil and Vinegar Dispenser Spouts | Airtight ClickSeal BPA Free Bottle Pourers Keeps Oil Fresh with Built-in Caps | Use Your Own Bottles as Vinegar Dispensers | Dishwasher Safe

Replace the lid with a bar top. One that can be closed to keep the air out. Like this: https://www.amazon.com/dp/B09YD7L4YV Not necessarily from Amazon, but this type has a piece that keeps out the air. These can be reused each time you buy a new bottle of oil or vinegar.